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Finding the Fourth Proportional to 387.40, 534.62 and 212.73

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Solution

The fourth proportional to 387.40, 534.62 and 212.73 is: 293.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.40 : 534.62 = 212.73 : x
  2. Step 2: Convert to fraction form
    387.40/534.62 = 212.73/x
  3. Step 3: Cross multiply
    387.40x = 534.62 × 212.73
  4. Step 4: Simplify right side
    387.40x = 113,728.65
  5. Step 5: Solve for x
    x = 113,728.65/387.40
  6. Step 6: Final answer
    x = 293.57

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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.