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Finding the Fourth Proportional to 770.30, 1,062.92 and 438.78

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Solution

The fourth proportional to 770.30, 1,062.92 and 438.78 is: 605.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.30 : 1,062.92 = 438.78 : x
  2. Step 2: Convert to fraction form
    770.30/1,062.92 = 438.78/x
  3. Step 3: Cross multiply
    770.30x = 1,062.92 × 438.78
  4. Step 4: Simplify right side
    770.30x = 466,388.04
  5. Step 5: Solve for x
    x = 466,388.04/770.30
  6. Step 6: Final answer
    x = 605.46

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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.