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Finding the Fourth Proportional to 387.18, 579.76 and 284.31

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Solution

The fourth proportional to 387.18, 579.76 and 284.31 is: 425.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.18 : 579.76 = 284.31 : x
  2. Step 2: Convert to fraction form
    387.18/579.76 = 284.31/x
  3. Step 3: Cross multiply
    387.18x = 579.76 × 284.31
  4. Step 4: Simplify right side
    387.18x = 164,830.85
  5. Step 5: Solve for x
    x = 164,830.85/387.18
  6. Step 6: Final answer
    x = 425.72

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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.