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Finding the Fourth Proportional to 609.90, 915.72 and 379.76

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Solution

The fourth proportional to 609.90, 915.72 and 379.76 is: 570.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.90 : 915.72 = 379.76 : x
  2. Step 2: Convert to fraction form
    609.90/915.72 = 379.76/x
  3. Step 3: Cross multiply
    609.90x = 915.72 × 379.76
  4. Step 4: Simplify right side
    609.90x = 347,753.83
  5. Step 5: Solve for x
    x = 347,753.83/609.90
  6. Step 6: Final answer
    x = 570.18

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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.