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Finding the Fourth Proportional to 507.25, 699.91 and 320.61

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Solution

The fourth proportional to 507.25, 699.91 and 320.61 is: 442.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.25 : 699.91 = 320.61 : x
  2. Step 2: Convert to fraction form
    507.25/699.91 = 320.61/x
  3. Step 3: Cross multiply
    507.25x = 699.91 × 320.61
  4. Step 4: Simplify right side
    507.25x = 224,396.71
  5. Step 5: Solve for x
    x = 224,396.71/507.25
  6. Step 6: Final answer
    x = 442.38

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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.