Home / 129,288.12-178,520.94-83,988.60

Finding the Fourth Proportional to 129,288.12, 178,520.94 and 83,988.60

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Solution

The fourth proportional to 129,288.12, 178,520.94 and 83,988.60 is: 115,971.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,288.12 : 178,520.94 = 83,988.60 : x
  2. Step 2: Convert to fraction form
    129,288.12/178,520.94 = 83,988.60/x
  3. Step 3: Cross multiply
    129,288.12x = 178,520.94 × 83,988.60
  4. Step 4: Simplify right side
    129,288.12x = 14,993,723,821.28
  5. Step 5: Solve for x
    x = 14,993,723,821.28/129,288.12
  6. Step 6: Final answer
    x = 115,971.40

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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.