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Finding the Fourth Proportional to 916.72, 1,375.17 and 396.91

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Solution

The fourth proportional to 916.72, 1,375.17 and 396.91 is: 595.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.72 : 1,375.17 = 396.91 : x
  2. Step 2: Convert to fraction form
    916.72/1,375.17 = 396.91/x
  3. Step 3: Cross multiply
    916.72x = 1,375.17 × 396.91
  4. Step 4: Simplify right side
    916.72x = 545,818.72
  5. Step 5: Solve for x
    x = 545,818.72/916.72
  6. Step 6: Final answer
    x = 595.40

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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.