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Finding the Fourth Proportional to 285.16, 427.73 and 79.74

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Solution

The fourth proportional to 285.16, 427.73 and 79.74 is: 119.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.16 : 427.73 = 79.74 : x
  2. Step 2: Convert to fraction form
    285.16/427.73 = 79.74/x
  3. Step 3: Cross multiply
    285.16x = 427.73 × 79.74
  4. Step 4: Simplify right side
    285.16x = 34,105.19
  5. Step 5: Solve for x
    x = 34,105.19/285.16
  6. Step 6: Final answer
    x = 119.60

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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.