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Finding the Fourth Proportional to 386.86, 532.44 and 345.42

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Solution

The fourth proportional to 386.86, 532.44 and 345.42 is: 475.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.86 : 532.44 = 345.42 : x
  2. Step 2: Convert to fraction form
    386.86/532.44 = 345.42/x
  3. Step 3: Cross multiply
    386.86x = 532.44 × 345.42
  4. Step 4: Simplify right side
    386.86x = 183,915.42
  5. Step 5: Solve for x
    x = 183,915.42/386.86
  6. Step 6: Final answer
    x = 475.41

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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.