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Finding the Fourth Proportional to 801.16, 1,105.78 and 539.40

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Solution

The fourth proportional to 801.16, 1,105.78 and 539.40 is: 744.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.16 : 1,105.78 = 539.40 : x
  2. Step 2: Convert to fraction form
    801.16/1,105.78 = 539.40/x
  3. Step 3: Cross multiply
    801.16x = 1,105.78 × 539.40
  4. Step 4: Simplify right side
    801.16x = 596,457.73
  5. Step 5: Solve for x
    x = 596,457.73/801.16
  6. Step 6: Final answer
    x = 744.49

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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.