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Finding the Fourth Proportional to 395.90, 544.71 and 386.69

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Solution

The fourth proportional to 395.90, 544.71 and 386.69 is: 532.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.90 : 544.71 = 386.69 : x
  2. Step 2: Convert to fraction form
    395.90/544.71 = 386.69/x
  3. Step 3: Cross multiply
    395.90x = 544.71 × 386.69
  4. Step 4: Simplify right side
    395.90x = 210,631.19
  5. Step 5: Solve for x
    x = 210,631.19/395.90
  6. Step 6: Final answer
    x = 532.04

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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.