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Finding the Fourth Proportional to 386.19, 532.94 and 211.53

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Solution

The fourth proportional to 386.19, 532.94 and 211.53 is: 291.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.19 : 532.94 = 211.53 : x
  2. Step 2: Convert to fraction form
    386.19/532.94 = 211.53/x
  3. Step 3: Cross multiply
    386.19x = 532.94 × 211.53
  4. Step 4: Simplify right side
    386.19x = 112,731.74
  5. Step 5: Solve for x
    x = 112,731.74/386.19
  6. Step 6: Final answer
    x = 291.91

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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.