Home / 129,120.15-178,124.34-86,119.50

Finding the Fourth Proportional to 129,120.15, 178,124.34 and 86,119.50

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Solution

The fourth proportional to 129,120.15, 178,124.34 and 86,119.50 is: 118,803.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,120.15 : 178,124.34 = 86,119.50 : x
  2. Step 2: Convert to fraction form
    129,120.15/178,124.34 = 86,119.50/x
  3. Step 3: Cross multiply
    129,120.15x = 178,124.34 × 86,119.50
  4. Step 4: Simplify right side
    129,120.15x = 15,339,979,098.63
  5. Step 5: Solve for x
    x = 15,339,979,098.63/129,120.15
  6. Step 6: Final answer
    x = 118,803.91

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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.