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Finding the Fourth Proportional to 561.46, 842.52 and 287.80

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Solution

The fourth proportional to 561.46, 842.52 and 287.80 is: 431.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.46 : 842.52 = 287.80 : x
  2. Step 2: Convert to fraction form
    561.46/842.52 = 287.80/x
  3. Step 3: Cross multiply
    561.46x = 842.52 × 287.80
  4. Step 4: Simplify right side
    561.46x = 242,477.26
  5. Step 5: Solve for x
    x = 242,477.26/561.46
  6. Step 6: Final answer
    x = 431.87

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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.