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Finding the Fourth Proportional to 703.71, 971.12 and 393.21

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Solution

The fourth proportional to 703.71, 971.12 and 393.21 is: 542.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    703.71 : 971.12 = 393.21 : x
  2. Step 2: Convert to fraction form
    703.71/971.12 = 393.21/x
  3. Step 3: Cross multiply
    703.71x = 971.12 × 393.21
  4. Step 4: Simplify right side
    703.71x = 381,854.10
  5. Step 5: Solve for x
    x = 381,854.10/703.71
  6. Step 6: Final answer
    x = 542.63

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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.