Home / 129,074.01-178,139.35-78,127.84

Finding the Fourth Proportional to 129,074.01, 178,139.35 and 78,127.84

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Solution

The fourth proportional to 129,074.01, 178,139.35 and 78,127.84 is: 107,826.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,074.01 : 178,139.35 = 78,127.84 : x
  2. Step 2: Convert to fraction form
    129,074.01/178,139.35 = 78,127.84/x
  3. Step 3: Cross multiply
    129,074.01x = 178,139.35 × 78,127.84
  4. Step 4: Simplify right side
    129,074.01x = 13,917,642,954.84
  5. Step 5: Solve for x
    x = 13,917,642,954.84/129,074.01
  6. Step 6: Final answer
    x = 107,826.85

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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.