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Finding the Fourth Proportional to 388.30, 582.45 and 266.19

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Solution

The fourth proportional to 388.30, 582.45 and 266.19 is: 399.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.30 : 582.45 = 266.19 : x
  2. Step 2: Convert to fraction form
    388.30/582.45 = 266.19/x
  3. Step 3: Cross multiply
    388.30x = 582.45 × 266.19
  4. Step 4: Simplify right side
    388.30x = 155,041.83
  5. Step 5: Solve for x
    x = 155,041.83/388.30
  6. Step 6: Final answer
    x = 399.29

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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.