Home / 129,365.20-178,511.32-72,775.36

Finding the Fourth Proportional to 129,365.20, 178,511.32 and 72,775.36

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Solution

The fourth proportional to 129,365.20, 178,511.32 and 72,775.36 is: 100,422.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,365.20 : 178,511.32 = 72,775.36 : x
  2. Step 2: Convert to fraction form
    129,365.20/178,511.32 = 72,775.36/x
  3. Step 3: Cross multiply
    129,365.20x = 178,511.32 × 72,775.36
  4. Step 4: Simplify right side
    129,365.20x = 12,991,225,577.08
  5. Step 5: Solve for x
    x = 12,991,225,577.08/129,365.20
  6. Step 6: Final answer
    x = 100,422.88

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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.