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Finding the Fourth Proportional to 690.82, 1,034.98 and 320.95

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Solution

The fourth proportional to 690.82, 1,034.98 and 320.95 is: 480.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.82 : 1,034.98 = 320.95 : x
  2. Step 2: Convert to fraction form
    690.82/1,034.98 = 320.95/x
  3. Step 3: Cross multiply
    690.82x = 1,034.98 × 320.95
  4. Step 4: Simplify right side
    690.82x = 332,176.83
  5. Step 5: Solve for x
    x = 332,176.83/690.82
  6. Step 6: Final answer
    x = 480.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.