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Finding the Fourth Proportional to 805.95, 1,208.94 and 318.99

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Solution

The fourth proportional to 805.95, 1,208.94 and 318.99 is: 478.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.95 : 1,208.94 = 318.99 : x
  2. Step 2: Convert to fraction form
    805.95/1,208.94 = 318.99/x
  3. Step 3: Cross multiply
    805.95x = 1,208.94 × 318.99
  4. Step 4: Simplify right side
    805.95x = 385,639.77
  5. Step 5: Solve for x
    x = 385,639.77/805.95
  6. Step 6: Final answer
    x = 478.49

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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.