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Finding the Fourth Proportional to 778.48, 1,073.70 and 612.46

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Solution

The fourth proportional to 778.48, 1,073.70 and 612.46 is: 844.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.48 : 1,073.70 = 612.46 : x
  2. Step 2: Convert to fraction form
    778.48/1,073.70 = 612.46/x
  3. Step 3: Cross multiply
    778.48x = 1,073.70 × 612.46
  4. Step 4: Simplify right side
    778.48x = 657,598.30
  5. Step 5: Solve for x
    x = 657,598.30/778.48
  6. Step 6: Final answer
    x = 844.72

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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.