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Finding the Fourth Proportional to 86,640.42, 129,964.14 and 27,474.78

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Solution

The fourth proportional to 86,640.42, 129,964.14 and 27,474.78 is: 41,213.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,640.42 : 129,964.14 = 27,474.78 : x
  2. Step 2: Convert to fraction form
    86,640.42/129,964.14 = 27,474.78/x
  3. Step 3: Cross multiply
    86,640.42x = 129,964.14 × 27,474.78
  4. Step 4: Simplify right side
    86,640.42x = 3,570,736,154.39
  5. Step 5: Solve for x
    x = 3,570,736,154.39/86,640.42
  6. Step 6: Final answer
    x = 41,213.28

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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.