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Finding the Fourth Proportional to 630.49, 939.58 and 611.71

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Solution

The fourth proportional to 630.49, 939.58 and 611.71 is: 911.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.49 : 939.58 = 611.71 : x
  2. Step 2: Convert to fraction form
    630.49/939.58 = 611.71/x
  3. Step 3: Cross multiply
    630.49x = 939.58 × 611.71
  4. Step 4: Simplify right side
    630.49x = 574,750.48
  5. Step 5: Solve for x
    x = 574,750.48/630.49
  6. Step 6: Final answer
    x = 911.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.