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Finding the Fourth Proportional to 747.40, 1,118.36 and 439.40

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Solution

The fourth proportional to 747.40, 1,118.36 and 439.40 is: 657.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.40 : 1,118.36 = 439.40 : x
  2. Step 2: Convert to fraction form
    747.40/1,118.36 = 439.40/x
  3. Step 3: Cross multiply
    747.40x = 1,118.36 × 439.40
  4. Step 4: Simplify right side
    747.40x = 491,402.89
  5. Step 5: Solve for x
    x = 491,402.89/747.40
  6. Step 6: Final answer
    x = 657.49

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.