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Finding the Fourth Proportional to 99,436.80, 148,924.80 and 68,102.40

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Solution

The fourth proportional to 99,436.80, 148,924.80 and 68,102.40 is: 101,995.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,436.80 : 148,924.80 = 68,102.40 : x
  2. Step 2: Convert to fraction form
    99,436.80/148,924.80 = 68,102.40/x
  3. Step 3: Cross multiply
    99,436.80x = 148,924.80 × 68,102.40
  4. Step 4: Simplify right side
    99,436.80x = 10,142,136,299.52
  5. Step 5: Solve for x
    x = 10,142,136,299.52/99,436.80
  6. Step 6: Final answer
    x = 101,995.80

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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.