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Finding the Fourth Proportional to 1,425.68, 2,139.33 and 879.20

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Solution

The fourth proportional to 1,425.68, 2,139.33 and 879.20 is: 1,319.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.68 : 2,139.33 = 879.20 : x
  2. Step 2: Convert to fraction form
    1,425.68/2,139.33 = 879.20/x
  3. Step 3: Cross multiply
    1,425.68x = 2,139.33 × 879.20
  4. Step 4: Simplify right side
    1,425.68x = 1,880,898.94
  5. Step 5: Solve for x
    x = 1,880,898.94/1,425.68
  6. Step 6: Final answer
    x = 1,319.30

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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.