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Finding the Fourth Proportional to 770.46, 1,063.21 and 421.13

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Solution

The fourth proportional to 770.46, 1,063.21 and 421.13 is: 581.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.46 : 1,063.21 = 421.13 : x
  2. Step 2: Convert to fraction form
    770.46/1,063.21 = 421.13/x
  3. Step 3: Cross multiply
    770.46x = 1,063.21 × 421.13
  4. Step 4: Simplify right side
    770.46x = 447,749.63
  5. Step 5: Solve for x
    x = 447,749.63/770.46
  6. Step 6: Final answer
    x = 581.15

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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.