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Finding the Fourth Proportional to 770.46, 1,063.26 and 438.90

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Solution

The fourth proportional to 770.46, 1,063.26 and 438.90 is: 605.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.46 : 1,063.26 = 438.90 : x
  2. Step 2: Convert to fraction form
    770.46/1,063.26 = 438.90/x
  3. Step 3: Cross multiply
    770.46x = 1,063.26 × 438.90
  4. Step 4: Simplify right side
    770.46x = 466,664.81
  5. Step 5: Solve for x
    x = 466,664.81/770.46
  6. Step 6: Final answer
    x = 605.70

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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.