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Finding the Fourth Proportional to 1,138.42, 1,707.72 and 397.90

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Solution

The fourth proportional to 1,138.42, 1,707.72 and 397.90 is: 596.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.42 : 1,707.72 = 397.90 : x
  2. Step 2: Convert to fraction form
    1,138.42/1,707.72 = 397.90/x
  3. Step 3: Cross multiply
    1,138.42x = 1,707.72 × 397.90
  4. Step 4: Simplify right side
    1,138.42x = 679,491.26
  5. Step 5: Solve for x
    x = 679,491.26/1,138.42
  6. Step 6: Final answer
    x = 596.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.