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Finding the Fourth Proportional to 522.30, 781.59 and 420.24

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Solution

The fourth proportional to 522.30, 781.59 and 420.24 is: 628.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.30 : 781.59 = 420.24 : x
  2. Step 2: Convert to fraction form
    522.30/781.59 = 420.24/x
  3. Step 3: Cross multiply
    522.30x = 781.59 × 420.24
  4. Step 4: Simplify right side
    522.30x = 328,455.38
  5. Step 5: Solve for x
    x = 328,455.38/522.30
  6. Step 6: Final answer
    x = 628.86

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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.