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Finding the Fourth Proportional to 1,355.47, 2,032.22 and 915.63

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Solution

The fourth proportional to 1,355.47, 2,032.22 and 915.63 is: 1,372.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.47 : 2,032.22 = 915.63 : x
  2. Step 2: Convert to fraction form
    1,355.47/2,032.22 = 915.63/x
  3. Step 3: Cross multiply
    1,355.47x = 2,032.22 × 915.63
  4. Step 4: Simplify right side
    1,355.47x = 1,860,761.60
  5. Step 5: Solve for x
    x = 1,860,761.60/1,355.47
  6. Step 6: Final answer
    x = 1,372.78

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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.