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Finding the Fourth Proportional to 257,426.80, 386,140.20 and 218,546.80

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Solution

The fourth proportional to 257,426.80, 386,140.20 and 218,546.80 is: 327,820.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,426.80 : 386,140.20 = 218,546.80 : x
  2. Step 2: Convert to fraction form
    257,426.80/386,140.20 = 218,546.80/x
  3. Step 3: Cross multiply
    257,426.80x = 386,140.20 × 218,546.80
  4. Step 4: Simplify right side
    257,426.80x = 84,389,705,061.36
  5. Step 5: Solve for x
    x = 84,389,705,061.36/257,426.80
  6. Step 6: Final answer
    x = 327,820.20

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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.