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Finding the Fourth Proportional to 143,398.80, 215,098.20 and 129,620.70

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Solution

The fourth proportional to 143,398.80, 215,098.20 and 129,620.70 is: 194,431.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,398.80 : 215,098.20 = 129,620.70 : x
  2. Step 2: Convert to fraction form
    143,398.80/215,098.20 = 129,620.70/x
  3. Step 3: Cross multiply
    143,398.80x = 215,098.20 × 129,620.70
  4. Step 4: Simplify right side
    143,398.80x = 27,881,179,252.74
  5. Step 5: Solve for x
    x = 27,881,179,252.74/143,398.80
  6. Step 6: Final answer
    x = 194,431.05

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1.5x scale

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.