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Finding the Fourth Proportional to 542.45, 814.77 and 478.89

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Solution

The fourth proportional to 542.45, 814.77 and 478.89 is: 719.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.45 : 814.77 = 478.89 : x
  2. Step 2: Convert to fraction form
    542.45/814.77 = 478.89/x
  3. Step 3: Cross multiply
    542.45x = 814.77 × 478.89
  4. Step 4: Simplify right side
    542.45x = 390,185.21
  5. Step 5: Solve for x
    x = 390,185.21/542.45
  6. Step 6: Final answer
    x = 719.30

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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.