Home / 129,210.41-178,310.37-72,621.78

Finding the Fourth Proportional to 129,210.41, 178,310.37 and 72,621.78

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Solution

The fourth proportional to 129,210.41, 178,310.37 and 72,621.78 is: 100,218.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,210.41 : 178,310.37 = 72,621.78 : x
  2. Step 2: Convert to fraction form
    129,210.41/178,310.37 = 72,621.78/x
  3. Step 3: Cross multiply
    129,210.41x = 178,310.37 × 72,621.78
  4. Step 4: Simplify right side
    129,210.41x = 12,949,216,098.75
  5. Step 5: Solve for x
    x = 12,949,216,098.75/129,210.41
  6. Step 6: Final answer
    x = 100,218.06

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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.