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Finding the Fourth Proportional to 807.99, 1,212.32 and 260.32

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Solution

The fourth proportional to 807.99, 1,212.32 and 260.32 is: 390.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.99 : 1,212.32 = 260.32 : x
  2. Step 2: Convert to fraction form
    807.99/1,212.32 = 260.32/x
  3. Step 3: Cross multiply
    807.99x = 1,212.32 × 260.32
  4. Step 4: Simplify right side
    807.99x = 315,591.14
  5. Step 5: Solve for x
    x = 315,591.14/807.99
  6. Step 6: Final answer
    x = 390.59

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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.