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Finding the Fourth Proportional to 386.18, 532.53 and 320.66

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Solution

The fourth proportional to 386.18, 532.53 and 320.66 is: 442.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.18 : 532.53 = 320.66 : x
  2. Step 2: Convert to fraction form
    386.18/532.53 = 320.66/x
  3. Step 3: Cross multiply
    386.18x = 532.53 × 320.66
  4. Step 4: Simplify right side
    386.18x = 170,761.07
  5. Step 5: Solve for x
    x = 170,761.07/386.18
  6. Step 6: Final answer
    x = 442.18

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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.