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Finding the Fourth Proportional to 205,720.40, 308,872.20 and 126,988.40

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Solution

The fourth proportional to 205,720.40, 308,872.20 and 126,988.40 is: 190,662.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,720.40 : 308,872.20 = 126,988.40 : x
  2. Step 2: Convert to fraction form
    205,720.40/308,872.20 = 126,988.40/x
  3. Step 3: Cross multiply
    205,720.40x = 308,872.20 × 126,988.40
  4. Step 4: Simplify right side
    205,720.40x = 39,223,186,482.48
  5. Step 5: Solve for x
    x = 39,223,186,482.48/205,720.40
  6. Step 6: Final answer
    x = 190,662.60

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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.