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Finding the Fourth Proportional to 781.28, 1,078.80 and 533.12

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Solution

The fourth proportional to 781.28, 1,078.80 and 533.12 is: 736.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.28 : 1,078.80 = 533.12 : x
  2. Step 2: Convert to fraction form
    781.28/1,078.80 = 533.12/x
  3. Step 3: Cross multiply
    781.28x = 1,078.80 × 533.12
  4. Step 4: Simplify right side
    781.28x = 575,129.86
  5. Step 5: Solve for x
    x = 575,129.86/781.28
  6. Step 6: Final answer
    x = 736.14

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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.