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Finding the Fourth Proportional to 610.72, 915.78 and 379.90

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Solution

The fourth proportional to 610.72, 915.78 and 379.90 is: 569.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.72 : 915.78 = 379.90 : x
  2. Step 2: Convert to fraction form
    610.72/915.78 = 379.90/x
  3. Step 3: Cross multiply
    610.72x = 915.78 × 379.90
  4. Step 4: Simplify right side
    610.72x = 347,904.82
  5. Step 5: Solve for x
    x = 347,904.82/610.72
  6. Step 6: Final answer
    x = 569.66

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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.