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Finding the Fourth Proportional to 864.62, 1,297.20 and 377.72

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Solution

The fourth proportional to 864.62, 1,297.20 and 377.72 is: 566.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.62 : 1,297.20 = 377.72 : x
  2. Step 2: Convert to fraction form
    864.62/1,297.20 = 377.72/x
  3. Step 3: Cross multiply
    864.62x = 1,297.20 × 377.72
  4. Step 4: Simplify right side
    864.62x = 489,978.38
  5. Step 5: Solve for x
    x = 489,978.38/864.62
  6. Step 6: Final answer
    x = 566.70

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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.