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Finding the Fourth Proportional to 100,990.25, 139,365.80 and 55,668.28

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Solution

The fourth proportional to 100,990.25, 139,365.80 and 55,668.28 is: 76,821.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,990.25 : 139,365.80 = 55,668.28 : x
  2. Step 2: Convert to fraction form
    100,990.25/139,365.80 = 55,668.28/x
  3. Step 3: Cross multiply
    100,990.25x = 139,365.80 × 55,668.28
  4. Step 4: Simplify right side
    100,990.25x = 7,758,253,401.65
  5. Step 5: Solve for x
    x = 7,758,253,401.65/100,990.25
  6. Step 6: Final answer
    x = 76,821.81

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1.5x scale

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.