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Finding the Fourth Proportional to 285.77, 428.67 and 251.77

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Solution

The fourth proportional to 285.77, 428.67 and 251.77 is: 377.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.77 : 428.67 = 251.77 : x
  2. Step 2: Convert to fraction form
    285.77/428.67 = 251.77/x
  3. Step 3: Cross multiply
    285.77x = 428.67 × 251.77
  4. Step 4: Simplify right side
    285.77x = 107,925.17
  5. Step 5: Solve for x
    x = 107,925.17/285.77
  6. Step 6: Final answer
    x = 377.67

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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.