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Finding the Fourth Proportional to 740.86, 1,115.39 and 654.68

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Solution

The fourth proportional to 740.86, 1,115.39 and 654.68 is: 985.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.86 : 1,115.39 = 654.68 : x
  2. Step 2: Convert to fraction form
    740.86/1,115.39 = 654.68/x
  3. Step 3: Cross multiply
    740.86x = 1,115.39 × 654.68
  4. Step 4: Simplify right side
    740.86x = 730,223.53
  5. Step 5: Solve for x
    x = 730,223.53/740.86
  6. Step 6: Final answer
    x = 985.64

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.