Home / 129,240.78-178,356.41-78,263.02

Finding the Fourth Proportional to 129,240.78, 178,356.41 and 78,263.02

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Solution

The fourth proportional to 129,240.78, 178,356.41 and 78,263.02 is: 108,005.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,240.78 : 178,356.41 = 78,263.02 : x
  2. Step 2: Convert to fraction form
    129,240.78/178,356.41 = 78,263.02/x
  3. Step 3: Cross multiply
    129,240.78x = 178,356.41 × 78,263.02
  4. Step 4: Simplify right side
    129,240.78x = 13,958,711,282.96
  5. Step 5: Solve for x
    x = 13,958,711,282.96/129,240.78
  6. Step 6: Final answer
    x = 108,005.47

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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.