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Finding the Fourth Proportional to 86,724.40, 130,086.60 and 65,729.20

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Solution

The fourth proportional to 86,724.40, 130,086.60 and 65,729.20 is: 98,593.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,724.40 : 130,086.60 = 65,729.20 : x
  2. Step 2: Convert to fraction form
    86,724.40/130,086.60 = 65,729.20/x
  3. Step 3: Cross multiply
    86,724.40x = 130,086.60 × 65,729.20
  4. Step 4: Simplify right side
    86,724.40x = 8,550,488,148.72
  5. Step 5: Solve for x
    x = 8,550,488,148.72/86,724.40
  6. Step 6: Final answer
    x = 98,593.80

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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.