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Finding the Fourth Proportional to 393.47, 589.92 and 187.92

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Solution

The fourth proportional to 393.47, 589.92 and 187.92 is: 281.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.47 : 589.92 = 187.92 : x
  2. Step 2: Convert to fraction form
    393.47/589.92 = 187.92/x
  3. Step 3: Cross multiply
    393.47x = 589.92 × 187.92
  4. Step 4: Simplify right side
    393.47x = 110,857.77
  5. Step 5: Solve for x
    x = 110,857.77/393.47
  6. Step 6: Final answer
    x = 281.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.