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Finding the Fourth Proportional to 442.78, 610.70 and 285.28

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Solution

The fourth proportional to 442.78, 610.70 and 285.28 is: 393.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.78 : 610.70 = 285.28 : x
  2. Step 2: Convert to fraction form
    442.78/610.70 = 285.28/x
  3. Step 3: Cross multiply
    442.78x = 610.70 × 285.28
  4. Step 4: Simplify right side
    442.78x = 174,220.50
  5. Step 5: Solve for x
    x = 174,220.50/442.78
  6. Step 6: Final answer
    x = 393.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.