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Finding the Fourth Proportional to 143,751.29, 215,388.57 and 87,421.01

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Solution

The fourth proportional to 143,751.29, 215,388.57 and 87,421.01 is: 130,986.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,751.29 : 215,388.57 = 87,421.01 : x
  2. Step 2: Convert to fraction form
    143,751.29/215,388.57 = 87,421.01/x
  3. Step 3: Cross multiply
    143,751.29x = 215,388.57 × 87,421.01
  4. Step 4: Simplify right side
    143,751.29x = 18,829,486,331.86
  5. Step 5: Solve for x
    x = 18,829,486,331.86/143,751.29
  6. Step 6: Final answer
    x = 130,986.56

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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.