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Finding the Fourth Proportional to 99,663.60, 149,203.80 and 66,421.20

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Solution

The fourth proportional to 99,663.60, 149,203.80 and 66,421.20 is: 99,437.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,663.60 : 149,203.80 = 66,421.20 : x
  2. Step 2: Convert to fraction form
    99,663.60/149,203.80 = 66,421.20/x
  3. Step 3: Cross multiply
    99,663.60x = 149,203.80 × 66,421.20
  4. Step 4: Simplify right side
    99,663.60x = 9,910,295,440.56
  5. Step 5: Solve for x
    x = 9,910,295,440.56/99,663.60
  6. Step 6: Final answer
    x = 99,437.46

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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.