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Finding the Fourth Proportional to 619.90, 855.03 and 542.14

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Solution

The fourth proportional to 619.90, 855.03 and 542.14 is: 747.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.90 : 855.03 = 542.14 : x
  2. Step 2: Convert to fraction form
    619.90/855.03 = 542.14/x
  3. Step 3: Cross multiply
    619.90x = 855.03 × 542.14
  4. Step 4: Simplify right side
    619.90x = 463,545.96
  5. Step 5: Solve for x
    x = 463,545.96/619.90
  6. Step 6: Final answer
    x = 747.78

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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.