Home / 158,987.20-219,403.53-86,390.78

Finding the Fourth Proportional to 158,987.20, 219,403.53 and 86,390.78

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Solution

The fourth proportional to 158,987.20, 219,403.53 and 86,390.78 is: 119,219.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,987.20 : 219,403.53 = 86,390.78 : x
  2. Step 2: Convert to fraction form
    158,987.20/219,403.53 = 86,390.78/x
  3. Step 3: Cross multiply
    158,987.20x = 219,403.53 × 86,390.78
  4. Step 4: Simplify right side
    158,987.20x = 18,954,442,091.45
  5. Step 5: Solve for x
    x = 18,954,442,091.45/158,987.20
  6. Step 6: Final answer
    x = 119,219.93

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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.