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Finding the Fourth Proportional to 915.98, 1,371.90 and 885.21

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Solution

The fourth proportional to 915.98, 1,371.90 and 885.21 is: 1,325.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.98 : 1,371.90 = 885.21 : x
  2. Step 2: Convert to fraction form
    915.98/1,371.90 = 885.21/x
  3. Step 3: Cross multiply
    915.98x = 1,371.90 × 885.21
  4. Step 4: Simplify right side
    915.98x = 1,214,419.60
  5. Step 5: Solve for x
    x = 1,214,419.60/915.98
  6. Step 6: Final answer
    x = 1,325.82

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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.