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Finding the Fourth Proportional to 528.78, 791.52 and 284.70

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Solution

The fourth proportional to 528.78, 791.52 and 284.70 is: 426.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.78 : 791.52 = 284.70 : x
  2. Step 2: Convert to fraction form
    528.78/791.52 = 284.70/x
  3. Step 3: Cross multiply
    528.78x = 791.52 × 284.70
  4. Step 4: Simplify right side
    528.78x = 225,345.74
  5. Step 5: Solve for x
    x = 225,345.74/528.78
  6. Step 6: Final answer
    x = 426.16

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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.