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Finding the Fourth Proportional to 621.90, 928.48 and 474.88

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Solution

The fourth proportional to 621.90, 928.48 and 474.88 is: 708.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.90 : 928.48 = 474.88 : x
  2. Step 2: Convert to fraction form
    621.90/928.48 = 474.88/x
  3. Step 3: Cross multiply
    621.90x = 928.48 × 474.88
  4. Step 4: Simplify right side
    621.90x = 440,915.71
  5. Step 5: Solve for x
    x = 440,915.71/621.90
  6. Step 6: Final answer
    x = 708.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.