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Finding the Fourth Proportional to 386.13, 532.81 and 228.71

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Solution

The fourth proportional to 386.13, 532.81 and 228.71 is: 315.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.13 : 532.81 = 228.71 : x
  2. Step 2: Convert to fraction form
    386.13/532.81 = 228.71/x
  3. Step 3: Cross multiply
    386.13x = 532.81 × 228.71
  4. Step 4: Simplify right side
    386.13x = 121,860.59
  5. Step 5: Solve for x
    x = 121,860.59/386.13
  6. Step 6: Final answer
    x = 315.60

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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.