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Finding the Fourth Proportional to 128,785.32, 177,826.50 and 86,380.20

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Solution

The fourth proportional to 128,785.32, 177,826.50 and 86,380.20 is: 119,273.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,785.32 : 177,826.50 = 86,380.20 : x
  2. Step 2: Convert to fraction form
    128,785.32/177,826.50 = 86,380.20/x
  3. Step 3: Cross multiply
    128,785.32x = 177,826.50 × 86,380.20
  4. Step 4: Simplify right side
    128,785.32x = 15,360,688,635.30
  5. Step 5: Solve for x
    x = 15,360,688,635.30/128,785.32
  6. Step 6: Final answer
    x = 119,273.60

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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.