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Finding the Fourth Proportional to 1,426.56, 2,139.87 and 425.81

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Solution

The fourth proportional to 1,426.56, 2,139.87 and 425.81 is: 638.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,426.56 : 2,139.87 = 425.81 : x
  2. Step 2: Convert to fraction form
    1,426.56/2,139.87 = 425.81/x
  3. Step 3: Cross multiply
    1,426.56x = 2,139.87 × 425.81
  4. Step 4: Simplify right side
    1,426.56x = 911,167.35
  5. Step 5: Solve for x
    x = 911,167.35/1,426.56
  6. Step 6: Final answer
    x = 638.72

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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.