Home / 143,917.20-215,875.80-91,429.20

Finding the Fourth Proportional to 143,917.20, 215,875.80 and 91,429.20

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Solution

The fourth proportional to 143,917.20, 215,875.80 and 91,429.20 is: 137,143.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,917.20 : 215,875.80 = 91,429.20 : x
  2. Step 2: Convert to fraction form
    143,917.20/215,875.80 = 91,429.20/x
  3. Step 3: Cross multiply
    143,917.20x = 215,875.80 × 91,429.20
  4. Step 4: Simplify right side
    143,917.20x = 19,737,351,693.36
  5. Step 5: Solve for x
    x = 19,737,351,693.36/143,917.20
  6. Step 6: Final answer
    x = 137,143.80

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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.