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Finding the Fourth Proportional to 86,679.60, 130,019.40 and 42,334.80

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Solution

The fourth proportional to 86,679.60, 130,019.40 and 42,334.80 is: 63,502.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,679.60 : 130,019.40 = 42,334.80 : x
  2. Step 2: Convert to fraction form
    86,679.60/130,019.40 = 42,334.80/x
  3. Step 3: Cross multiply
    86,679.60x = 130,019.40 × 42,334.80
  4. Step 4: Simplify right side
    86,679.60x = 5,504,345,295.12
  5. Step 5: Solve for x
    x = 5,504,345,295.12/86,679.60
  6. Step 6: Final answer
    x = 63,502.20

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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.