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Finding the Fourth Proportional to 85,400.80, 128,139.60 and 38,629.60

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Solution

The fourth proportional to 85,400.80, 128,139.60 and 38,629.60 is: 57,961.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,400.80 : 128,139.60 = 38,629.60 : x
  2. Step 2: Convert to fraction form
    85,400.80/128,139.60 = 38,629.60/x
  3. Step 3: Cross multiply
    85,400.80x = 128,139.60 × 38,629.60
  4. Step 4: Simplify right side
    85,400.80x = 4,949,981,492.16
  5. Step 5: Solve for x
    x = 4,949,981,492.16/85,400.80
  6. Step 6: Final answer
    x = 57,961.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.