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Finding the Fourth Proportional to 388.68, 582.20 and 358.72

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Solution

The fourth proportional to 388.68, 582.20 and 358.72 is: 537.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.68 : 582.20 = 358.72 : x
  2. Step 2: Convert to fraction form
    388.68/582.20 = 358.72/x
  3. Step 3: Cross multiply
    388.68x = 582.20 × 358.72
  4. Step 4: Simplify right side
    388.68x = 208,846.78
  5. Step 5: Solve for x
    x = 208,846.78/388.68
  6. Step 6: Final answer
    x = 537.32

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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.