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Finding the Fourth Proportional to 99,885.60, 149,730.30 and 49,890.78

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Solution

The fourth proportional to 99,885.60, 149,730.30 and 49,890.78 is: 74,787.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,885.60 : 149,730.30 = 49,890.78 : x
  2. Step 2: Convert to fraction form
    99,885.60/149,730.30 = 49,890.78/x
  3. Step 3: Cross multiply
    99,885.60x = 149,730.30 × 49,890.78
  4. Step 4: Simplify right side
    99,885.60x = 7,470,161,456.63
  5. Step 5: Solve for x
    x = 7,470,161,456.63/99,885.60
  6. Step 6: Final answer
    x = 74,787.17

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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.