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Finding the Fourth Proportional to 542.07, 747.95 and 309.20

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Solution

The fourth proportional to 542.07, 747.95 and 309.20 is: 426.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.07 : 747.95 = 309.20 : x
  2. Step 2: Convert to fraction form
    542.07/747.95 = 309.20/x
  3. Step 3: Cross multiply
    542.07x = 747.95 × 309.20
  4. Step 4: Simplify right side
    542.07x = 231,263.17
  5. Step 5: Solve for x
    x = 231,263.17/542.07
  6. Step 6: Final answer
    x = 426.63

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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.