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Finding the Fourth Proportional to 285.19, 427.77 and 79.76

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Solution

The fourth proportional to 285.19, 427.77 and 79.76 is: 119.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.19 : 427.77 = 79.76 : x
  2. Step 2: Convert to fraction form
    285.19/427.77 = 79.76/x
  3. Step 3: Cross multiply
    285.19x = 427.77 × 79.76
  4. Step 4: Simplify right side
    285.19x = 34,118.94
  5. Step 5: Solve for x
    x = 34,118.94/285.19
  6. Step 6: Final answer
    x = 119.64

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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.