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Finding the Fourth Proportional to 488.78, 732.75 and 280.50

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Solution

The fourth proportional to 488.78, 732.75 and 280.50 is: 420.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.78 : 732.75 = 280.50 : x
  2. Step 2: Convert to fraction form
    488.78/732.75 = 280.50/x
  3. Step 3: Cross multiply
    488.78x = 732.75 × 280.50
  4. Step 4: Simplify right side
    488.78x = 205,536.38
  5. Step 5: Solve for x
    x = 205,536.38/488.78
  6. Step 6: Final answer
    x = 420.51

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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.