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Finding the Fourth Proportional to 285.11, 393.51 and 160.77

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Solution

The fourth proportional to 285.11, 393.51 and 160.77 is: 221.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.11 : 393.51 = 160.77 : x
  2. Step 2: Convert to fraction form
    285.11/393.51 = 160.77/x
  3. Step 3: Cross multiply
    285.11x = 393.51 × 160.77
  4. Step 4: Simplify right side
    285.11x = 63,266.08
  5. Step 5: Solve for x
    x = 63,266.08/285.11
  6. Step 6: Final answer
    x = 221.90

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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.