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Finding the Fourth Proportional to 389.66, 537.72 and 212.61

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Solution

The fourth proportional to 389.66, 537.72 and 212.61 is: 293.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.66 : 537.72 = 212.61 : x
  2. Step 2: Convert to fraction form
    389.66/537.72 = 212.61/x
  3. Step 3: Cross multiply
    389.66x = 537.72 × 212.61
  4. Step 4: Simplify right side
    389.66x = 114,324.65
  5. Step 5: Solve for x
    x = 114,324.65/389.66
  6. Step 6: Final answer
    x = 293.40

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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.