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Finding the Fourth Proportional to 285.05, 427.53 and 79.63

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Solution

The fourth proportional to 285.05, 427.53 and 79.63 is: 119.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.05 : 427.53 = 79.63 : x
  2. Step 2: Convert to fraction form
    285.05/427.53 = 79.63/x
  3. Step 3: Cross multiply
    285.05x = 427.53 × 79.63
  4. Step 4: Simplify right side
    285.05x = 34,044.21
  5. Step 5: Solve for x
    x = 34,044.21/285.05
  6. Step 6: Final answer
    x = 119.43

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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.