Home / 100,987.80-139,364.11-55,667.55

Finding the Fourth Proportional to 100,987.80, 139,364.11 and 55,667.55

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Solution

The fourth proportional to 100,987.80, 139,364.11 and 55,667.55 is: 76,821.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,987.80 : 139,364.11 = 55,667.55 : x
  2. Step 2: Convert to fraction form
    100,987.80/139,364.11 = 55,667.55/x
  3. Step 3: Cross multiply
    100,987.80x = 139,364.11 × 55,667.55
  4. Step 4: Simplify right side
    100,987.80x = 7,758,059,153.83
  5. Step 5: Solve for x
    x = 7,758,059,153.83/100,987.80
  6. Step 6: Final answer
    x = 76,821.75

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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.