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Finding the Fourth Proportional to 100,908.13, 139,264.15 and 55,590.75

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Solution

The fourth proportional to 100,908.13, 139,264.15 and 55,590.75 is: 76,721.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,908.13 : 139,264.15 = 55,590.75 : x
  2. Step 2: Convert to fraction form
    100,908.13/139,264.15 = 55,590.75/x
  3. Step 3: Cross multiply
    100,908.13x = 139,264.15 × 55,590.75
  4. Step 4: Simplify right side
    100,908.13x = 7,741,799,033.75
  5. Step 5: Solve for x
    x = 7,741,799,033.75/100,908.13
  6. Step 6: Final answer
    x = 76,721.26

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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.