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Finding the Fourth Proportional to 811.48, 1,210.60 and 789.16

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Solution

The fourth proportional to 811.48, 1,210.60 and 789.16 is: 1,177.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.48 : 1,210.60 = 789.16 : x
  2. Step 2: Convert to fraction form
    811.48/1,210.60 = 789.16/x
  3. Step 3: Cross multiply
    811.48x = 1,210.60 × 789.16
  4. Step 4: Simplify right side
    811.48x = 955,357.10
  5. Step 5: Solve for x
    x = 955,357.10/811.48
  6. Step 6: Final answer
    x = 1,177.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.