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Finding the Fourth Proportional to 66,442.40, 99,663.60 and 65,859.20

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Solution

The fourth proportional to 66,442.40, 99,663.60 and 65,859.20 is: 98,788.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,442.40 : 99,663.60 = 65,859.20 : x
  2. Step 2: Convert to fraction form
    66,442.40/99,663.60 = 65,859.20/x
  3. Step 3: Cross multiply
    66,442.40x = 99,663.60 × 65,859.20
  4. Step 4: Simplify right side
    66,442.40x = 6,563,764,965.12
  5. Step 5: Solve for x
    x = 6,563,764,965.12/66,442.40
  6. Step 6: Final answer
    x = 98,788.80

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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.