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Finding the Fourth Proportional to 128,335.80, 192,503.70 and 123,670.20

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Solution

The fourth proportional to 128,335.80, 192,503.70 and 123,670.20 is: 185,505.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,335.80 : 192,503.70 = 123,670.20 : x
  2. Step 2: Convert to fraction form
    128,335.80/192,503.70 = 123,670.20/x
  3. Step 3: Cross multiply
    128,335.80x = 192,503.70 × 123,670.20
  4. Step 4: Simplify right side
    128,335.80x = 23,806,971,079.74
  5. Step 5: Solve for x
    x = 23,806,971,079.74/128,335.80
  6. Step 6: Final answer
    x = 185,505.30

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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.