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Finding the Fourth Proportional to 915.90, 1,262.55 and 636.15

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Solution

The fourth proportional to 915.90, 1,262.55 and 636.15 is: 876.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.90 : 1,262.55 = 636.15 : x
  2. Step 2: Convert to fraction form
    915.90/1,262.55 = 636.15/x
  3. Step 3: Cross multiply
    915.90x = 1,262.55 × 636.15
  4. Step 4: Simplify right side
    915.90x = 803,164.87
  5. Step 5: Solve for x
    x = 803,164.87/915.90
  6. Step 6: Final answer
    x = 876.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.