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Finding the Fourth Proportional to 199,988.90, 299,999.32 and 66,869.86

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Solution

The fourth proportional to 199,988.90, 299,999.32 and 66,869.86 is: 100,310.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    199,988.90 : 299,999.32 = 66,869.86 : x
  2. Step 2: Convert to fraction form
    199,988.90/299,999.32 = 66,869.86/x
  3. Step 3: Cross multiply
    199,988.90x = 299,999.32 × 66,869.86
  4. Step 4: Simplify right side
    199,988.90x = 20,060,912,528.50
  5. Step 5: Solve for x
    x = 20,060,912,528.50/199,988.90
  6. Step 6: Final answer
    x = 100,310.13

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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.