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Finding the Fourth Proportional to 442.80, 610.95 and 285.36

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Solution

The fourth proportional to 442.80, 610.95 and 285.36 is: 393.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.80 : 610.95 = 285.36 : x
  2. Step 2: Convert to fraction form
    442.80/610.95 = 285.36/x
  3. Step 3: Cross multiply
    442.80x = 610.95 × 285.36
  4. Step 4: Simplify right side
    442.80x = 174,340.69
  5. Step 5: Solve for x
    x = 174,340.69/442.80
  6. Step 6: Final answer
    x = 393.72

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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.