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Finding the Fourth Proportional to 206,863.20, 310,294.80 and 128,131.20

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Solution

The fourth proportional to 206,863.20, 310,294.80 and 128,131.20 is: 192,196.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,863.20 : 310,294.80 = 128,131.20 : x
  2. Step 2: Convert to fraction form
    206,863.20/310,294.80 = 128,131.20/x
  3. Step 3: Cross multiply
    206,863.20x = 310,294.80 × 128,131.20
  4. Step 4: Simplify right side
    206,863.20x = 39,758,445,077.76
  5. Step 5: Solve for x
    x = 39,758,445,077.76/206,863.20
  6. Step 6: Final answer
    x = 192,196.80

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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.