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Finding the Fourth Proportional to 100,894.08, 139,231.80 and 63,189.12

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Solution

The fourth proportional to 100,894.08, 139,231.80 and 63,189.12 is: 87,199.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,894.08 : 139,231.80 = 63,189.12 : x
  2. Step 2: Convert to fraction form
    100,894.08/139,231.80 = 63,189.12/x
  3. Step 3: Cross multiply
    100,894.08x = 139,231.80 × 63,189.12
  4. Step 4: Simplify right side
    100,894.08x = 8,797,934,918.02
  5. Step 5: Solve for x
    x = 8,797,934,918.02/100,894.08
  6. Step 6: Final answer
    x = 87,199.71

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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.