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Finding the Fourth Proportional to 100,627.92, 138,869.85 and 55,307.51

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Solution

The fourth proportional to 100,627.92, 138,869.85 and 55,307.51 is: 76,326.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,627.92 : 138,869.85 = 55,307.51 : x
  2. Step 2: Convert to fraction form
    100,627.92/138,869.85 = 55,307.51/x
  3. Step 3: Cross multiply
    100,627.92x = 138,869.85 × 55,307.51
  4. Step 4: Simplify right side
    100,627.92x = 7,680,545,651.39
  5. Step 5: Solve for x
    x = 7,680,545,651.39/100,627.92
  6. Step 6: Final answer
    x = 76,326.19

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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.