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Finding the Fourth Proportional to 609.12, 841.12 and 388.13

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Solution

The fourth proportional to 609.12, 841.12 and 388.13 is: 535.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.12 : 841.12 = 388.13 : x
  2. Step 2: Convert to fraction form
    609.12/841.12 = 388.13/x
  3. Step 3: Cross multiply
    609.12x = 841.12 × 388.13
  4. Step 4: Simplify right side
    609.12x = 326,458.73
  5. Step 5: Solve for x
    x = 326,458.73/609.12
  6. Step 6: Final answer
    x = 535.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.