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Finding the Fourth Proportional to 609.47, 841.43 and 388.61

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Solution

The fourth proportional to 609.47, 841.43 and 388.61 is: 536.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.47 : 841.43 = 388.61 : x
  2. Step 2: Convert to fraction form
    609.47/841.43 = 388.61/x
  3. Step 3: Cross multiply
    609.47x = 841.43 × 388.61
  4. Step 4: Simplify right side
    609.47x = 326,988.11
  5. Step 5: Solve for x
    x = 326,988.11/609.47
  6. Step 6: Final answer
    x = 536.51

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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.