Home / 129,513.22-178,680.85-78,489.16

Finding the Fourth Proportional to 129,513.22, 178,680.85 and 78,489.16

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Solution

The fourth proportional to 129,513.22, 178,680.85 and 78,489.16 is: 108,286.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,513.22 : 178,680.85 = 78,489.16 : x
  2. Step 2: Convert to fraction form
    129,513.22/178,680.85 = 78,489.16/x
  3. Step 3: Cross multiply
    129,513.22x = 178,680.85 × 78,489.16
  4. Step 4: Simplify right side
    129,513.22x = 14,024,509,181.66
  5. Step 5: Solve for x
    x = 14,024,509,181.66/129,513.22
  6. Step 6: Final answer
    x = 108,286.32

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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.