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Finding the Fourth Proportional to 261,796.80, 391,528.80 and 219,806.40

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Solution

The fourth proportional to 261,796.80, 391,528.80 and 219,806.40 is: 328,730.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,796.80 : 391,528.80 = 219,806.40 : x
  2. Step 2: Convert to fraction form
    261,796.80/391,528.80 = 219,806.40/x
  3. Step 3: Cross multiply
    261,796.80x = 391,528.80 × 219,806.40
  4. Step 4: Simplify right side
    261,796.80x = 86,060,536,024.32
  5. Step 5: Solve for x
    x = 86,060,536,024.32/261,796.80
  6. Step 6: Final answer
    x = 328,730.28

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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.