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Finding the Fourth Proportional to 839.17, 1,257.90 and 406.09

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Solution

The fourth proportional to 839.17, 1,257.90 and 406.09 is: 608.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.17 : 1,257.90 = 406.09 : x
  2. Step 2: Convert to fraction form
    839.17/1,257.90 = 406.09/x
  3. Step 3: Cross multiply
    839.17x = 1,257.90 × 406.09
  4. Step 4: Simplify right side
    839.17x = 510,820.61
  5. Step 5: Solve for x
    x = 510,820.61/839.17
  6. Step 6: Final answer
    x = 608.72

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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.