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Finding the Fourth Proportional to 770.38, 1,063.14 and 421.09

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Solution

The fourth proportional to 770.38, 1,063.14 and 421.09 is: 581.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.38 : 1,063.14 = 421.09 : x
  2. Step 2: Convert to fraction form
    770.38/1,063.14 = 421.09/x
  3. Step 3: Cross multiply
    770.38x = 1,063.14 × 421.09
  4. Step 4: Simplify right side
    770.38x = 447,677.62
  5. Step 5: Solve for x
    x = 447,677.62/770.38
  6. Step 6: Final answer
    x = 581.11

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1.5x scale

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.