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Finding the Fourth Proportional to 143,987.68, 198,610.48 and 87,399.06

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Solution

The fourth proportional to 143,987.68, 198,610.48 and 87,399.06 is: 120,554.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,987.68 : 198,610.48 = 87,399.06 : x
  2. Step 2: Convert to fraction form
    143,987.68/198,610.48 = 87,399.06/x
  3. Step 3: Cross multiply
    143,987.68x = 198,610.48 × 87,399.06
  4. Step 4: Simplify right side
    143,987.68x = 17,358,369,258.15
  5. Step 5: Solve for x
    x = 17,358,369,258.15/143,987.68
  6. Step 6: Final answer
    x = 120,554.55

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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.