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Finding the Fourth Proportional to 805.66, 1,208.69 and 476.87

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Solution

The fourth proportional to 805.66, 1,208.69 and 476.87 is: 715.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.66 : 1,208.69 = 476.87 : x
  2. Step 2: Convert to fraction form
    805.66/1,208.69 = 476.87/x
  3. Step 3: Cross multiply
    805.66x = 1,208.69 × 476.87
  4. Step 4: Simplify right side
    805.66x = 576,379.57
  5. Step 5: Solve for x
    x = 576,379.57/805.66
  6. Step 6: Final answer
    x = 715.42

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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.