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Finding the Fourth Proportional to 916.72, 1,375.04 and 658.87

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Solution

The fourth proportional to 916.72, 1,375.04 and 658.87 is: 988.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.72 : 1,375.04 = 658.87 : x
  2. Step 2: Convert to fraction form
    916.72/1,375.04 = 658.87/x
  3. Step 3: Cross multiply
    916.72x = 1,375.04 × 658.87
  4. Step 4: Simplify right side
    916.72x = 905,973.84
  5. Step 5: Solve for x
    x = 905,973.84/916.72
  6. Step 6: Final answer
    x = 988.28

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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.