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Finding the Fourth Proportional to 807.88, 1,212.88 and 479.42

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Solution

The fourth proportional to 807.88, 1,212.88 and 479.42 is: 719.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.88 : 1,212.88 = 479.42 : x
  2. Step 2: Convert to fraction form
    807.88/1,212.88 = 479.42/x
  3. Step 3: Cross multiply
    807.88x = 1,212.88 × 479.42
  4. Step 4: Simplify right side
    807.88x = 581,478.93
  5. Step 5: Solve for x
    x = 581,478.93/807.88
  6. Step 6: Final answer
    x = 719.76

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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.