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Finding the Fourth Proportional to 136,920.60, 188,943.65 and 76,479.20

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Solution

The fourth proportional to 136,920.60, 188,943.65 and 76,479.20 is: 105,537.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,920.60 : 188,943.65 = 76,479.20 : x
  2. Step 2: Convert to fraction form
    136,920.60/188,943.65 = 76,479.20/x
  3. Step 3: Cross multiply
    136,920.60x = 188,943.65 × 76,479.20
  4. Step 4: Simplify right side
    136,920.60x = 14,450,259,197.08
  5. Step 5: Solve for x
    x = 14,450,259,197.08/136,920.60
  6. Step 6: Final answer
    x = 105,537.51

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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.