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Finding the Fourth Proportional to 688.35, 1,032.81 and 380.18

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Solution

The fourth proportional to 688.35, 1,032.81 and 380.18 is: 570.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.35 : 1,032.81 = 380.18 : x
  2. Step 2: Convert to fraction form
    688.35/1,032.81 = 380.18/x
  3. Step 3: Cross multiply
    688.35x = 1,032.81 × 380.18
  4. Step 4: Simplify right side
    688.35x = 392,648.54
  5. Step 5: Solve for x
    x = 392,648.54/688.35
  6. Step 6: Final answer
    x = 570.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.