Home / 129,900.25-179,243.10-78,886.38

Finding the Fourth Proportional to 129,900.25, 179,243.10 and 78,886.38

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Solution

The fourth proportional to 129,900.25, 179,243.10 and 78,886.38 is: 108,851.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,900.25 : 179,243.10 = 78,886.38 : x
  2. Step 2: Convert to fraction form
    129,900.25/179,243.10 = 78,886.38/x
  3. Step 3: Cross multiply
    129,900.25x = 179,243.10 × 78,886.38
  4. Step 4: Simplify right side
    129,900.25x = 14,139,839,298.98
  5. Step 5: Solve for x
    x = 14,139,839,298.98/129,900.25
  6. Step 6: Final answer
    x = 108,851.52

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1.5x scale

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.