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Finding the Fourth Proportional to 99,981.92, 149,968.92 and 55,580.60

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Solution

The fourth proportional to 99,981.92, 149,968.92 and 55,580.60 is: 83,368.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,981.92 : 149,968.92 = 55,580.60 : x
  2. Step 2: Convert to fraction form
    99,981.92/149,968.92 = 55,580.60/x
  3. Step 3: Cross multiply
    99,981.92x = 149,968.92 × 55,580.60
  4. Step 4: Simplify right side
    99,981.92x = 8,335,362,554.95
  5. Step 5: Solve for x
    x = 8,335,362,554.95/99,981.92
  6. Step 6: Final answer
    x = 83,368.70

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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.