Home / 121,139.26-167,101.32-78,726.04

Finding the Fourth Proportional to 121,139.26, 167,101.32 and 78,726.04

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Solution

The fourth proportional to 121,139.26, 167,101.32 and 78,726.04 is: 108,595.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,139.26 : 167,101.32 = 78,726.04 : x
  2. Step 2: Convert to fraction form
    121,139.26/167,101.32 = 78,726.04/x
  3. Step 3: Cross multiply
    121,139.26x = 167,101.32 × 78,726.04
  4. Step 4: Simplify right side
    121,139.26x = 13,155,225,202.37
  5. Step 5: Solve for x
    x = 13,155,225,202.37/121,139.26
  6. Step 6: Final answer
    x = 108,595.89

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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.