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Finding the Fourth Proportional to 915.75, 1,264.31 and 635.89

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Solution

The fourth proportional to 915.75, 1,264.31 and 635.89 is: 877.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.75 : 1,264.31 = 635.89 : x
  2. Step 2: Convert to fraction form
    915.75/1,264.31 = 635.89/x
  3. Step 3: Cross multiply
    915.75x = 1,264.31 × 635.89
  4. Step 4: Simplify right side
    915.75x = 803,962.09
  5. Step 5: Solve for x
    x = 803,962.09/915.75
  6. Step 6: Final answer
    x = 877.93

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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.