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Finding the Fourth Proportional to 206,877.20, 310,315.80 and 128,145.20

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Solution

The fourth proportional to 206,877.20, 310,315.80 and 128,145.20 is: 192,217.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,877.20 : 310,315.80 = 128,145.20 : x
  2. Step 2: Convert to fraction form
    206,877.20/310,315.80 = 128,145.20/x
  3. Step 3: Cross multiply
    206,877.20x = 310,315.80 × 128,145.20
  4. Step 4: Simplify right side
    206,877.20x = 39,765,480,254.16
  5. Step 5: Solve for x
    x = 39,765,480,254.16/206,877.20
  6. Step 6: Final answer
    x = 192,217.80

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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.