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Finding the Fourth Proportional to 388.05, 534.69 and 356.61

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Solution

The fourth proportional to 388.05, 534.69 and 356.61 is: 491.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.05 : 534.69 = 356.61 : x
  2. Step 2: Convert to fraction form
    388.05/534.69 = 356.61/x
  3. Step 3: Cross multiply
    388.05x = 534.69 × 356.61
  4. Step 4: Simplify right side
    388.05x = 190,675.80
  5. Step 5: Solve for x
    x = 190,675.80/388.05
  6. Step 6: Final answer
    x = 491.37

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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.