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Finding the Fourth Proportional to 1,312.38, 1,811.43 and 789.12

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Solution

The fourth proportional to 1,312.38, 1,811.43 and 789.12 is: 1,089.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.38 : 1,811.43 = 789.12 : x
  2. Step 2: Convert to fraction form
    1,312.38/1,811.43 = 789.12/x
  3. Step 3: Cross multiply
    1,312.38x = 1,811.43 × 789.12
  4. Step 4: Simplify right side
    1,312.38x = 1,429,435.64
  5. Step 5: Solve for x
    x = 1,429,435.64/1,312.38
  6. Step 6: Final answer
    x = 1,089.19

Related Problems

Find fourth proportional to 656.19, 905.72 and 394.56
Half scale
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Double scale
Find fourth proportional to 1,313.38, 1,812.81 and 790.12
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.