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Finding the Fourth Proportional to 400.78, 601.53 and 285.67

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Solution

The fourth proportional to 400.78, 601.53 and 285.67 is: 428.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.78 : 601.53 = 285.67 : x
  2. Step 2: Convert to fraction form
    400.78/601.53 = 285.67/x
  3. Step 3: Cross multiply
    400.78x = 601.53 × 285.67
  4. Step 4: Simplify right side
    400.78x = 171,839.08
  5. Step 5: Solve for x
    x = 171,839.08/400.78
  6. Step 6: Final answer
    x = 428.76

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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.