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Finding the Fourth Proportional to 442.72, 664.14 and 260.12

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Solution

The fourth proportional to 442.72, 664.14 and 260.12 is: 390.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.72 : 664.14 = 260.12 : x
  2. Step 2: Convert to fraction form
    442.72/664.14 = 260.12/x
  3. Step 3: Cross multiply
    442.72x = 664.14 × 260.12
  4. Step 4: Simplify right side
    442.72x = 172,756.10
  5. Step 5: Solve for x
    x = 172,756.10/442.72
  6. Step 6: Final answer
    x = 390.22

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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.