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Finding the Fourth Proportional to 611.30, 916.13 and 515.72

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Solution

The fourth proportional to 611.30, 916.13 and 515.72 is: 772.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.30 : 916.13 = 515.72 : x
  2. Step 2: Convert to fraction form
    611.30/916.13 = 515.72/x
  3. Step 3: Cross multiply
    611.30x = 916.13 × 515.72
  4. Step 4: Simplify right side
    611.30x = 472,459.40
  5. Step 5: Solve for x
    x = 472,459.40/611.30
  6. Step 6: Final answer
    x = 772.88

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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.