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Finding the Fourth Proportional to 99,628.80, 149,443.20 and 89,787.30

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Solution

The fourth proportional to 99,628.80, 149,443.20 and 89,787.30 is: 134,680.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,628.80 : 149,443.20 = 89,787.30 : x
  2. Step 2: Convert to fraction form
    99,628.80/149,443.20 = 89,787.30/x
  3. Step 3: Cross multiply
    99,628.80x = 149,443.20 × 89,787.30
  4. Step 4: Simplify right side
    99,628.80x = 13,418,101,431.36
  5. Step 5: Solve for x
    x = 13,418,101,431.36/99,628.80
  6. Step 6: Final answer
    x = 134,680.95

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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.