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Finding the Fourth Proportional to 1,115.14, 1,538.90 and 672.95

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Solution

The fourth proportional to 1,115.14, 1,538.90 and 672.95 is: 928.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.14 : 1,538.90 = 672.95 : x
  2. Step 2: Convert to fraction form
    1,115.14/1,538.90 = 672.95/x
  3. Step 3: Cross multiply
    1,115.14x = 1,538.90 × 672.95
  4. Step 4: Simplify right side
    1,115.14x = 1,035,611.17
  5. Step 5: Solve for x
    x = 1,035,611.17/1,115.14
  6. Step 6: Final answer
    x = 928.68

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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.