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Finding the Fourth Proportional to 915.17, 1,261.81 and 693.73

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Solution

The fourth proportional to 915.17, 1,261.81 and 693.73 is: 956.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.17 : 1,261.81 = 693.73 : x
  2. Step 2: Convert to fraction form
    915.17/1,261.81 = 693.73/x
  3. Step 3: Cross multiply
    915.17x = 1,261.81 × 693.73
  4. Step 4: Simplify right side
    915.17x = 875,355.45
  5. Step 5: Solve for x
    x = 875,355.45/915.17
  6. Step 6: Final answer
    x = 956.49

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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.