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Finding the Fourth Proportional to 143,722.61, 215,420.44 and 87,438.65

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Solution

The fourth proportional to 143,722.61, 215,420.44 and 87,438.65 is: 131,058.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,722.61 : 215,420.44 = 87,438.65 : x
  2. Step 2: Convert to fraction form
    143,722.61/215,420.44 = 87,438.65/x
  3. Step 3: Cross multiply
    143,722.61x = 215,420.44 × 87,438.65
  4. Step 4: Simplify right side
    143,722.61x = 18,836,072,869.67
  5. Step 5: Solve for x
    x = 18,836,072,869.67/143,722.61
  6. Step 6: Final answer
    x = 131,058.52

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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.