Home / 129,690.90-178,969.80-72,331.95

Finding the Fourth Proportional to 129,690.90, 178,969.80 and 72,331.95

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Solution

The fourth proportional to 129,690.90, 178,969.80 and 72,331.95 is: 99,816.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,690.90 : 178,969.80 = 72,331.95 : x
  2. Step 2: Convert to fraction form
    129,690.90/178,969.80 = 72,331.95/x
  3. Step 3: Cross multiply
    129,690.90x = 178,969.80 × 72,331.95
  4. Step 4: Simplify right side
    129,690.90x = 12,945,234,625.11
  5. Step 5: Solve for x
    x = 12,945,234,625.11/129,690.90
  6. Step 6: Final answer
    x = 99,816.06

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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.