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Finding the Fourth Proportional to 392.68, 545.53 and 389.11

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Solution

The fourth proportional to 392.68, 545.53 and 389.11 is: 540.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.68 : 545.53 = 389.11 : x
  2. Step 2: Convert to fraction form
    392.68/545.53 = 389.11/x
  3. Step 3: Cross multiply
    392.68x = 545.53 × 389.11
  4. Step 4: Simplify right side
    392.68x = 212,270.59
  5. Step 5: Solve for x
    x = 212,270.59/392.68
  6. Step 6: Final answer
    x = 540.57

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.