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Finding the Fourth Proportional to 143,629.80, 215,444.70 and 81,421.80

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Solution

The fourth proportional to 143,629.80, 215,444.70 and 81,421.80 is: 122,132.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,629.80 : 215,444.70 = 81,421.80 : x
  2. Step 2: Convert to fraction form
    143,629.80/215,444.70 = 81,421.80/x
  3. Step 3: Cross multiply
    143,629.80x = 215,444.70 × 81,421.80
  4. Step 4: Simplify right side
    143,629.80x = 17,541,895,274.46
  5. Step 5: Solve for x
    x = 17,541,895,274.46/143,629.80
  6. Step 6: Final answer
    x = 122,132.70

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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.