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Finding the Fourth Proportional to 770.92, 1,063.87 and 421.61

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Solution

The fourth proportional to 770.92, 1,063.87 and 421.61 is: 581.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.92 : 1,063.87 = 421.61 : x
  2. Step 2: Convert to fraction form
    770.92/1,063.87 = 421.61/x
  3. Step 3: Cross multiply
    770.92x = 1,063.87 × 421.61
  4. Step 4: Simplify right side
    770.92x = 448,531.86
  5. Step 5: Solve for x
    x = 448,531.86/770.92
  6. Step 6: Final answer
    x = 581.82

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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.