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Finding the Fourth Proportional to 778.66, 1,073.95 and 551.43

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Solution

The fourth proportional to 778.66, 1,073.95 and 551.43 is: 760.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.66 : 1,073.95 = 551.43 : x
  2. Step 2: Convert to fraction form
    778.66/1,073.95 = 551.43/x
  3. Step 3: Cross multiply
    778.66x = 1,073.95 × 551.43
  4. Step 4: Simplify right side
    778.66x = 592,206.87
  5. Step 5: Solve for x
    x = 592,206.87/778.66
  6. Step 6: Final answer
    x = 760.55

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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.