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Finding the Fourth Proportional to 285.49, 393.60 and 187.21

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Solution

The fourth proportional to 285.49, 393.60 and 187.21 is: 258.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.49 : 393.60 = 187.21 : x
  2. Step 2: Convert to fraction form
    285.49/393.60 = 187.21/x
  3. Step 3: Cross multiply
    285.49x = 393.60 × 187.21
  4. Step 4: Simplify right side
    285.49x = 73,685.86
  5. Step 5: Solve for x
    x = 73,685.86/285.49
  6. Step 6: Final answer
    x = 258.10

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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.