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Finding the Fourth Proportional to 442.78, 611.26 and 342.98

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Solution

The fourth proportional to 442.78, 611.26 and 342.98 is: 473.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.78 : 611.26 = 342.98 : x
  2. Step 2: Convert to fraction form
    442.78/611.26 = 342.98/x
  3. Step 3: Cross multiply
    442.78x = 611.26 × 342.98
  4. Step 4: Simplify right side
    442.78x = 209,647.10
  5. Step 5: Solve for x
    x = 209,647.10/442.78
  6. Step 6: Final answer
    x = 473.48

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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.