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Finding the Fourth Proportional to 99,420.60, 148,912.20 and 88,339.80

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Solution

The fourth proportional to 99,420.60, 148,912.20 and 88,339.80 is: 132,315.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,420.60 : 148,912.20 = 88,339.80 : x
  2. Step 2: Convert to fraction form
    99,420.60/148,912.20 = 88,339.80/x
  3. Step 3: Cross multiply
    99,420.60x = 148,912.20 × 88,339.80
  4. Step 4: Simplify right side
    99,420.60x = 13,154,873,965.56
  5. Step 5: Solve for x
    x = 13,154,873,965.56/99,420.60
  6. Step 6: Final answer
    x = 132,315.37

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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.