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Finding the Fourth Proportional to 1,115.09, 1,538.58 and 672.98

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Solution

The fourth proportional to 1,115.09, 1,538.58 and 672.98 is: 928.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.09 : 1,538.58 = 672.98 : x
  2. Step 2: Convert to fraction form
    1,115.09/1,538.58 = 672.98/x
  3. Step 3: Cross multiply
    1,115.09x = 1,538.58 × 672.98
  4. Step 4: Simplify right side
    1,115.09x = 1,035,433.57
  5. Step 5: Solve for x
    x = 1,035,433.57/1,115.09
  6. Step 6: Final answer
    x = 928.57

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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.