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Finding the Fourth Proportional to 998.34, 1,377.02 and 915.72

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Solution

The fourth proportional to 998.34, 1,377.02 and 915.72 is: 1,263.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.34 : 1,377.02 = 915.72 : x
  2. Step 2: Convert to fraction form
    998.34/1,377.02 = 915.72/x
  3. Step 3: Cross multiply
    998.34x = 1,377.02 × 915.72
  4. Step 4: Simplify right side
    998.34x = 1,260,964.75
  5. Step 5: Solve for x
    x = 1,260,964.75/998.34
  6. Step 6: Final answer
    x = 1,263.06

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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.