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Finding the Fourth Proportional to 609.61, 841.12 and 388.88

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Solution

The fourth proportional to 609.61, 841.12 and 388.88 is: 536.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.61 : 841.12 = 388.88 : x
  2. Step 2: Convert to fraction form
    609.61/841.12 = 388.88/x
  3. Step 3: Cross multiply
    609.61x = 841.12 × 388.88
  4. Step 4: Simplify right side
    609.61x = 327,094.75
  5. Step 5: Solve for x
    x = 327,094.75/609.61
  6. Step 6: Final answer
    x = 536.56

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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.