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Finding the Fourth Proportional to 123,578.40, 185,367.60 and 83,920.80

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Solution

The fourth proportional to 123,578.40, 185,367.60 and 83,920.80 is: 125,881.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,578.40 : 185,367.60 = 83,920.80 : x
  2. Step 2: Convert to fraction form
    123,578.40/185,367.60 = 83,920.80/x
  3. Step 3: Cross multiply
    123,578.40x = 185,367.60 × 83,920.80
  4. Step 4: Simplify right side
    123,578.40x = 15,556,197,286.08
  5. Step 5: Solve for x
    x = 15,556,197,286.08/123,578.40
  6. Step 6: Final answer
    x = 125,881.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.