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Finding the Fourth Proportional to 778.10, 1,073.70 and 483.45

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Solution

The fourth proportional to 778.10, 1,073.70 and 483.45 is: 667.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.10 : 1,073.70 = 483.45 : x
  2. Step 2: Convert to fraction form
    778.10/1,073.70 = 483.45/x
  3. Step 3: Cross multiply
    778.10x = 1,073.70 × 483.45
  4. Step 4: Simplify right side
    778.10x = 519,080.27
  5. Step 5: Solve for x
    x = 519,080.27/778.10
  6. Step 6: Final answer
    x = 667.12

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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.