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Finding the Fourth Proportional to 609.81, 841.67 and 388.71

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Solution

The fourth proportional to 609.81, 841.67 and 388.71 is: 536.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.81 : 841.67 = 388.71 : x
  2. Step 2: Convert to fraction form
    609.81/841.67 = 388.71/x
  3. Step 3: Cross multiply
    609.81x = 841.67 × 388.71
  4. Step 4: Simplify right side
    609.81x = 327,165.55
  5. Step 5: Solve for x
    x = 327,165.55/609.81
  6. Step 6: Final answer
    x = 536.50

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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.