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Finding the Fourth Proportional to 770.46, 1,069.50 and 721.86

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Solution

The fourth proportional to 770.46, 1,069.50 and 721.86 is: 1,002.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.46 : 1,069.50 = 721.86 : x
  2. Step 2: Convert to fraction form
    770.46/1,069.50 = 721.86/x
  3. Step 3: Cross multiply
    770.46x = 1,069.50 × 721.86
  4. Step 4: Simplify right side
    770.46x = 772,023.92
  5. Step 5: Solve for x
    x = 772,023.92/770.46
  6. Step 6: Final answer
    x = 1,002.04

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.