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Finding the Fourth Proportional to 285.55, 393.86 and 192.31

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Solution

The fourth proportional to 285.55, 393.86 and 192.31 is: 265.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.55 : 393.86 = 192.31 : x
  2. Step 2: Convert to fraction form
    285.55/393.86 = 192.31/x
  3. Step 3: Cross multiply
    285.55x = 393.86 × 192.31
  4. Step 4: Simplify right side
    285.55x = 75,742.71
  5. Step 5: Solve for x
    x = 75,742.71/285.55
  6. Step 6: Final answer
    x = 265.25

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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.