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Finding the Fourth Proportional to 561.68, 842.88 and 318.38

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Solution

The fourth proportional to 561.68, 842.88 and 318.38 is: 477.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.68 : 842.88 = 318.38 : x
  2. Step 2: Convert to fraction form
    561.68/842.88 = 318.38/x
  3. Step 3: Cross multiply
    561.68x = 842.88 × 318.38
  4. Step 4: Simplify right side
    561.68x = 268,356.13
  5. Step 5: Solve for x
    x = 268,356.13/561.68
  6. Step 6: Final answer
    x = 477.77

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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.