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Finding the Fourth Proportional to 285.88, 428.88 and 80.51

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Solution

The fourth proportional to 285.88, 428.88 and 80.51 is: 120.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.88 : 428.88 = 80.51 : x
  2. Step 2: Convert to fraction form
    285.88/428.88 = 80.51/x
  3. Step 3: Cross multiply
    285.88x = 428.88 × 80.51
  4. Step 4: Simplify right side
    285.88x = 34,526.58
  5. Step 5: Solve for x
    x = 34,526.58/285.88
  6. Step 6: Final answer
    x = 120.77

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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.