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Finding the Fourth Proportional to 915.05, 1,372.68 and 790.43

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Solution

The fourth proportional to 915.05, 1,372.68 and 790.43 is: 1,185.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.05 : 1,372.68 = 790.43 : x
  2. Step 2: Convert to fraction form
    915.05/1,372.68 = 790.43/x
  3. Step 3: Cross multiply
    915.05x = 1,372.68 × 790.43
  4. Step 4: Simplify right side
    915.05x = 1,085,000.59
  5. Step 5: Solve for x
    x = 1,085,000.59/915.05
  6. Step 6: Final answer
    x = 1,185.72

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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.