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Finding the Fourth Proportional to 787.70, 1,086.40 and 551.56

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Solution

The fourth proportional to 787.70, 1,086.40 and 551.56 is: 760.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.70 : 1,086.40 = 551.56 : x
  2. Step 2: Convert to fraction form
    787.70/1,086.40 = 551.56/x
  3. Step 3: Cross multiply
    787.70x = 1,086.40 × 551.56
  4. Step 4: Simplify right side
    787.70x = 599,214.78
  5. Step 5: Solve for x
    x = 599,214.78/787.70
  6. Step 6: Final answer
    x = 760.71

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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.