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Finding the Fourth Proportional to 143,419.20, 215,128.80 and 103,790.40

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Solution

The fourth proportional to 143,419.20, 215,128.80 and 103,790.40 is: 155,685.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,419.20 : 215,128.80 = 103,790.40 : x
  2. Step 2: Convert to fraction form
    143,419.20/215,128.80 = 103,790.40/x
  3. Step 3: Cross multiply
    143,419.20x = 215,128.80 × 103,790.40
  4. Step 4: Simplify right side
    143,419.20x = 22,328,304,203.52
  5. Step 5: Solve for x
    x = 22,328,304,203.52/143,419.20
  6. Step 6: Final answer
    x = 155,685.60

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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.