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Finding the Fourth Proportional to 542.51, 748.40 and 355.91

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Solution

The fourth proportional to 542.51, 748.40 and 355.91 is: 490.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.51 : 748.40 = 355.91 : x
  2. Step 2: Convert to fraction form
    542.51/748.40 = 355.91/x
  3. Step 3: Cross multiply
    542.51x = 748.40 × 355.91
  4. Step 4: Simplify right side
    542.51x = 266,363.14
  5. Step 5: Solve for x
    x = 266,363.14/542.51
  6. Step 6: Final answer
    x = 490.99

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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.