Home / 129,235.25-178,360.35-78,246.71

Finding the Fourth Proportional to 129,235.25, 178,360.35 and 78,246.71

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Solution

The fourth proportional to 129,235.25, 178,360.35 and 78,246.71 is: 107,989.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,235.25 : 178,360.35 = 78,246.71 : x
  2. Step 2: Convert to fraction form
    129,235.25/178,360.35 = 78,246.71/x
  3. Step 3: Cross multiply
    129,235.25x = 178,360.35 × 78,246.71
  4. Step 4: Simplify right side
    129,235.25x = 13,956,109,690.15
  5. Step 5: Solve for x
    x = 13,956,109,690.15/129,235.25
  6. Step 6: Final answer
    x = 107,989.97

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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.