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Finding the Fourth Proportional to 100,861.70, 138,888.66 and 98,623.86

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Solution

The fourth proportional to 100,861.70, 138,888.66 and 98,623.86 is: 135,807.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,861.70 : 138,888.66 = 98,623.86 : x
  2. Step 2: Convert to fraction form
    100,861.70/138,888.66 = 98,623.86/x
  3. Step 3: Cross multiply
    100,861.70x = 138,888.66 × 98,623.86
  4. Step 4: Simplify right side
    100,861.70x = 13,697,735,759.43
  5. Step 5: Solve for x
    x = 13,697,735,759.43/100,861.70
  6. Step 6: Final answer
    x = 135,807.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.