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Finding the Fourth Proportional to 388.28, 582.11 and 266.18

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Solution

The fourth proportional to 388.28, 582.11 and 266.18 is: 399.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.28 : 582.11 = 266.18 : x
  2. Step 2: Convert to fraction form
    388.28/582.11 = 266.18/x
  3. Step 3: Cross multiply
    388.28x = 582.11 × 266.18
  4. Step 4: Simplify right side
    388.28x = 154,941.80
  5. Step 5: Solve for x
    x = 154,941.80/388.28
  6. Step 6: Final answer
    x = 399.05

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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.