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Finding the Fourth Proportional to 85,589.76, 128,400.72 and 38,845.92

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Solution

The fourth proportional to 85,589.76, 128,400.72 and 38,845.92 is: 58,276.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,589.76 : 128,400.72 = 38,845.92 : x
  2. Step 2: Convert to fraction form
    85,589.76/128,400.72 = 38,845.92/x
  3. Step 3: Cross multiply
    85,589.76x = 128,400.72 × 38,845.92
  4. Step 4: Simplify right side
    85,589.76x = 4,987,844,097.06
  5. Step 5: Solve for x
    x = 4,987,844,097.06/85,589.76
  6. Step 6: Final answer
    x = 58,276.18

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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.