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Finding the Fourth Proportional to 1,427.34, 2,138.05 and 731.91

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Solution

The fourth proportional to 1,427.34, 2,138.05 and 731.91 is: 1,096.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,427.34 : 2,138.05 = 731.91 : x
  2. Step 2: Convert to fraction form
    1,427.34/2,138.05 = 731.91/x
  3. Step 3: Cross multiply
    1,427.34x = 2,138.05 × 731.91
  4. Step 4: Simplify right side
    1,427.34x = 1,564,860.18
  5. Step 5: Solve for x
    x = 1,564,860.18/1,427.34
  6. Step 6: Final answer
    x = 1,096.35

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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.