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Finding the Fourth Proportional to 915.60, 1,261.28 and 694.48

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Solution

The fourth proportional to 915.60, 1,261.28 and 694.48 is: 956.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.60 : 1,261.28 = 694.48 : x
  2. Step 2: Convert to fraction form
    915.60/1,261.28 = 694.48/x
  3. Step 3: Cross multiply
    915.60x = 1,261.28 × 694.48
  4. Step 4: Simplify right side
    915.60x = 875,933.73
  5. Step 5: Solve for x
    x = 875,933.73/915.60
  6. Step 6: Final answer
    x = 956.68

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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.