Home / 1,316.55-1,811.25-1,280.10

Finding the Fourth Proportional to 1,316.55, 1,811.25 and 1,280.10

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Solution

The fourth proportional to 1,316.55, 1,811.25 and 1,280.10 is: 1,761.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.55 : 1,811.25 = 1,280.10 : x
  2. Step 2: Convert to fraction form
    1,316.55/1,811.25 = 1,280.10/x
  3. Step 3: Cross multiply
    1,316.55x = 1,811.25 × 1,280.10
  4. Step 4: Simplify right side
    1,316.55x = 2,318,581.13
  5. Step 5: Solve for x
    x = 2,318,581.13/1,316.55
  6. Step 6: Final answer
    x = 1,761.10

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Double scale
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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.