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Finding the Fourth Proportional to 539.33, 807.78 and 442.13

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Solution

The fourth proportional to 539.33, 807.78 and 442.13 is: 662.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.33 : 807.78 = 442.13 : x
  2. Step 2: Convert to fraction form
    539.33/807.78 = 442.13/x
  3. Step 3: Cross multiply
    539.33x = 807.78 × 442.13
  4. Step 4: Simplify right side
    539.33x = 357,145.79
  5. Step 5: Solve for x
    x = 357,145.79/539.33
  6. Step 6: Final answer
    x = 662.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.