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Finding the Fourth Proportional to 915.96, 1,372.87 and 521.01

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Solution

The fourth proportional to 915.96, 1,372.87 and 521.01 is: 780.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.96 : 1,372.87 = 521.01 : x
  2. Step 2: Convert to fraction form
    915.96/1,372.87 = 521.01/x
  3. Step 3: Cross multiply
    915.96x = 1,372.87 × 521.01
  4. Step 4: Simplify right side
    915.96x = 715,277.25
  5. Step 5: Solve for x
    x = 715,277.25/915.96
  6. Step 6: Final answer
    x = 780.91

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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.