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Finding the Fourth Proportional to 712.18, 982.90 and 479.31

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Solution

The fourth proportional to 712.18, 982.90 and 479.31 is: 661.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.18 : 982.90 = 479.31 : x
  2. Step 2: Convert to fraction form
    712.18/982.90 = 479.31/x
  3. Step 3: Cross multiply
    712.18x = 982.90 × 479.31
  4. Step 4: Simplify right side
    712.18x = 471,113.80
  5. Step 5: Solve for x
    x = 471,113.80/712.18
  6. Step 6: Final answer
    x = 661.51

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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.