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Finding the Fourth Proportional to 388.20, 535.98 and 346.62

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Solution

The fourth proportional to 388.20, 535.98 and 346.62 is: 478.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.20 : 535.98 = 346.62 : x
  2. Step 2: Convert to fraction form
    388.20/535.98 = 346.62/x
  3. Step 3: Cross multiply
    388.20x = 535.98 × 346.62
  4. Step 4: Simplify right side
    388.20x = 185,781.39
  5. Step 5: Solve for x
    x = 185,781.39/388.20
  6. Step 6: Final answer
    x = 478.57

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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.