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Finding the Fourth Proportional to 778.42, 1,074.30 and 483.70

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Solution

The fourth proportional to 778.42, 1,074.30 and 483.70 is: 667.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.42 : 1,074.30 = 483.70 : x
  2. Step 2: Convert to fraction form
    778.42/1,074.30 = 483.70/x
  3. Step 3: Cross multiply
    778.42x = 1,074.30 × 483.70
  4. Step 4: Simplify right side
    778.42x = 519,638.91
  5. Step 5: Solve for x
    x = 519,638.91/778.42
  6. Step 6: Final answer
    x = 667.56

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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.