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Finding the Fourth Proportional to 703.38, 970.66 and 392.88

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Solution

The fourth proportional to 703.38, 970.66 and 392.88 is: 542.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    703.38 : 970.66 = 392.88 : x
  2. Step 2: Convert to fraction form
    703.38/970.66 = 392.88/x
  3. Step 3: Cross multiply
    703.38x = 970.66 × 392.88
  4. Step 4: Simplify right side
    703.38x = 381,352.90
  5. Step 5: Solve for x
    x = 381,352.90/703.38
  6. Step 6: Final answer
    x = 542.17

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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.