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Finding the Fourth Proportional to 85,640.60, 128,473.20 and 26,480.88

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Solution

The fourth proportional to 85,640.60, 128,473.20 and 26,480.88 is: 39,725.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,640.60 : 128,473.20 = 26,480.88 : x
  2. Step 2: Convert to fraction form
    85,640.60/128,473.20 = 26,480.88/x
  3. Step 3: Cross multiply
    85,640.60x = 128,473.20 × 26,480.88
  4. Step 4: Simplify right side
    85,640.60x = 3,402,083,392.42
  5. Step 5: Solve for x
    x = 3,402,083,392.42/85,640.60
  6. Step 6: Final answer
    x = 39,725.12

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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.