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Finding the Fourth Proportional to 65,921.60, 99,112.80 and 64,539.20

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Solution

The fourth proportional to 65,921.60, 99,112.80 and 64,539.20 is: 97,034.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,921.60 : 99,112.80 = 64,539.20 : x
  2. Step 2: Convert to fraction form
    65,921.60/99,112.80 = 64,539.20/x
  3. Step 3: Cross multiply
    65,921.60x = 99,112.80 × 64,539.20
  4. Step 4: Simplify right side
    65,921.60x = 6,396,660,821.76
  5. Step 5: Solve for x
    x = 6,396,660,821.76/65,921.60
  6. Step 6: Final answer
    x = 97,034.37

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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.