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Finding the Fourth Proportional to 630.49, 870.16 and 394.68

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Solution

The fourth proportional to 630.49, 870.16 and 394.68 is: 544.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.49 : 870.16 = 394.68 : x
  2. Step 2: Convert to fraction form
    630.49/870.16 = 394.68/x
  3. Step 3: Cross multiply
    630.49x = 870.16 × 394.68
  4. Step 4: Simplify right side
    630.49x = 343,434.75
  5. Step 5: Solve for x
    x = 343,434.75/630.49
  6. Step 6: Final answer
    x = 544.71

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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.