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Finding the Fourth Proportional to 99,428.40, 149,142.48 and 68,168.88

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Solution

The fourth proportional to 99,428.40, 149,142.48 and 68,168.88 is: 102,253.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,428.40 : 149,142.48 = 68,168.88 : x
  2. Step 2: Convert to fraction form
    99,428.40/149,142.48 = 68,168.88/x
  3. Step 3: Cross multiply
    99,428.40x = 149,142.48 × 68,168.88
  4. Step 4: Simplify right side
    99,428.40x = 10,166,875,822.02
  5. Step 5: Solve for x
    x = 10,166,875,822.02/99,428.40
  6. Step 6: Final answer
    x = 102,253.24

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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.