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Finding the Fourth Proportional to 215,676.80, 323,515.20 and 137,139.20

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Solution

The fourth proportional to 215,676.80, 323,515.20 and 137,139.20 is: 205,708.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,676.80 : 323,515.20 = 137,139.20 : x
  2. Step 2: Convert to fraction form
    215,676.80/323,515.20 = 137,139.20/x
  3. Step 3: Cross multiply
    215,676.80x = 323,515.20 × 137,139.20
  4. Step 4: Simplify right side
    215,676.80x = 44,366,615,715.84
  5. Step 5: Solve for x
    x = 44,366,615,715.84/215,676.80
  6. Step 6: Final answer
    x = 205,708.80

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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.