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Finding the Fourth Proportional to 787.80, 1,086.66 and 554.52

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Solution

The fourth proportional to 787.80, 1,086.66 and 554.52 is: 764.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.80 : 1,086.66 = 554.52 : x
  2. Step 2: Convert to fraction form
    787.80/1,086.66 = 554.52/x
  3. Step 3: Cross multiply
    787.80x = 1,086.66 × 554.52
  4. Step 4: Simplify right side
    787.80x = 602,574.70
  5. Step 5: Solve for x
    x = 602,574.70/787.80
  6. Step 6: Final answer
    x = 764.88

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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.