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Finding the Fourth Proportional to 417.70, 576.21 and 284.86

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Solution

The fourth proportional to 417.70, 576.21 and 284.86 is: 392.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.70 : 576.21 = 284.86 : x
  2. Step 2: Convert to fraction form
    417.70/576.21 = 284.86/x
  3. Step 3: Cross multiply
    417.70x = 576.21 × 284.86
  4. Step 4: Simplify right side
    417.70x = 164,139.18
  5. Step 5: Solve for x
    x = 164,139.18/417.70
  6. Step 6: Final answer
    x = 392.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.