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Finding the Fourth Proportional to 462.28, 691.86 and 389.25

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Solution

The fourth proportional to 462.28, 691.86 and 389.25 is: 582.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.28 : 691.86 = 389.25 : x
  2. Step 2: Convert to fraction form
    462.28/691.86 = 389.25/x
  3. Step 3: Cross multiply
    462.28x = 691.86 × 389.25
  4. Step 4: Simplify right side
    462.28x = 269,303.05
  5. Step 5: Solve for x
    x = 269,303.05/462.28
  6. Step 6: Final answer
    x = 582.55

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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.