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Finding the Fourth Proportional to 387.38, 579.45 and 358.22

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Solution

The fourth proportional to 387.38, 579.45 and 358.22 is: 535.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.38 : 579.45 = 358.22 : x
  2. Step 2: Convert to fraction form
    387.38/579.45 = 358.22/x
  3. Step 3: Cross multiply
    387.38x = 579.45 × 358.22
  4. Step 4: Simplify right side
    387.38x = 207,573.37
  5. Step 5: Solve for x
    x = 207,573.37/387.38
  6. Step 6: Final answer
    x = 535.84

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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.