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Finding the Fourth Proportional to 386.46, 532.89 and 253.71

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Solution

The fourth proportional to 386.46, 532.89 and 253.71 is: 349.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.46 : 532.89 = 253.71 : x
  2. Step 2: Convert to fraction form
    386.46/532.89 = 253.71/x
  3. Step 3: Cross multiply
    386.46x = 532.89 × 253.71
  4. Step 4: Simplify right side
    386.46x = 135,199.52
  5. Step 5: Solve for x
    x = 135,199.52/386.46
  6. Step 6: Final answer
    x = 349.84

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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.