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Finding the Fourth Proportional to 143,570.56, 198,134.40 and 86,987.20

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Solution

The fourth proportional to 143,570.56, 198,134.40 and 86,987.20 is: 120,046.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,570.56 : 198,134.40 = 86,987.20 : x
  2. Step 2: Convert to fraction form
    143,570.56/198,134.40 = 86,987.20/x
  3. Step 3: Cross multiply
    143,570.56x = 198,134.40 × 86,987.20
  4. Step 4: Simplify right side
    143,570.56x = 17,235,156,679.68
  5. Step 5: Solve for x
    x = 17,235,156,679.68/143,570.56
  6. Step 6: Final answer
    x = 120,046.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.