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Finding the Fourth Proportional to 916.59, 1,374.89 and 915.24

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Solution

The fourth proportional to 916.59, 1,374.89 and 915.24 is: 1,372.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.59 : 1,374.89 = 915.24 : x
  2. Step 2: Convert to fraction form
    916.59/1,374.89 = 915.24/x
  3. Step 3: Cross multiply
    916.59x = 1,374.89 × 915.24
  4. Step 4: Simplify right side
    916.59x = 1,258,349.75
  5. Step 5: Solve for x
    x = 1,258,349.75/916.59
  6. Step 6: Final answer
    x = 1,372.86

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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.