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Finding the Fourth Proportional to 85,843.32, 128,724.12 and 26,679.84

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Solution

The fourth proportional to 85,843.32, 128,724.12 and 26,679.84 is: 40,007.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,843.32 : 128,724.12 = 26,679.84 : x
  2. Step 2: Convert to fraction form
    85,843.32/128,724.12 = 26,679.84/x
  3. Step 3: Cross multiply
    85,843.32x = 128,724.12 × 26,679.84
  4. Step 4: Simplify right side
    85,843.32x = 3,434,338,925.74
  5. Step 5: Solve for x
    x = 3,434,338,925.74/85,843.32
  6. Step 6: Final answer
    x = 40,007.06

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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.