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Finding the Fourth Proportional to 561.17, 842.36 and 318.17

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Solution

The fourth proportional to 561.17, 842.36 and 318.17 is: 477.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.17 : 842.36 = 318.17 : x
  2. Step 2: Convert to fraction form
    561.17/842.36 = 318.17/x
  3. Step 3: Cross multiply
    561.17x = 842.36 × 318.17
  4. Step 4: Simplify right side
    561.17x = 268,012.09
  5. Step 5: Solve for x
    x = 268,012.09/561.17
  6. Step 6: Final answer
    x = 477.60

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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.