Home / 129,685.05-178,961.81-72,326.12

Finding the Fourth Proportional to 129,685.05, 178,961.81 and 72,326.12

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Solution

The fourth proportional to 129,685.05, 178,961.81 and 72,326.12 is: 99,808.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,685.05 : 178,961.81 = 72,326.12 : x
  2. Step 2: Convert to fraction form
    129,685.05/178,961.81 = 72,326.12/x
  3. Step 3: Cross multiply
    129,685.05x = 178,961.81 × 72,326.12
  4. Step 4: Simplify right side
    129,685.05x = 12,943,612,089.04
  5. Step 5: Solve for x
    x = 12,943,612,089.04/129,685.05
  6. Step 6: Final answer
    x = 99,808.05

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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.