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Finding the Fourth Proportional to 100,909.88, 139,255.67 and 58,493.01

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Solution

The fourth proportional to 100,909.88, 139,255.67 and 58,493.01 is: 80,720.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,909.88 : 139,255.67 = 58,493.01 : x
  2. Step 2: Convert to fraction form
    100,909.88/139,255.67 = 58,493.01/x
  3. Step 3: Cross multiply
    100,909.88x = 139,255.67 × 58,493.01
  4. Step 4: Simplify right side
    100,909.88x = 8,145,483,005.40
  5. Step 5: Solve for x
    x = 8,145,483,005.40/100,909.88
  6. Step 6: Final answer
    x = 80,720.38

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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.