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Finding the Fourth Proportional to 915.76, 1,262.88 and 617.28

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Solution

The fourth proportional to 915.76, 1,262.88 and 617.28 is: 851.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.76 : 1,262.88 = 617.28 : x
  2. Step 2: Convert to fraction form
    915.76/1,262.88 = 617.28/x
  3. Step 3: Cross multiply
    915.76x = 1,262.88 × 617.28
  4. Step 4: Simplify right side
    915.76x = 779,550.57
  5. Step 5: Solve for x
    x = 779,550.57/915.76
  6. Step 6: Final answer
    x = 851.26

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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.