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Finding the Fourth Proportional to 561.87, 842.40 and 287.75

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Solution

The fourth proportional to 561.87, 842.40 and 287.75 is: 431.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.87 : 842.40 = 287.75 : x
  2. Step 2: Convert to fraction form
    561.87/842.40 = 287.75/x
  3. Step 3: Cross multiply
    561.87x = 842.40 × 287.75
  4. Step 4: Simplify right side
    561.87x = 242,402.71
  5. Step 5: Solve for x
    x = 242,402.71/561.87
  6. Step 6: Final answer
    x = 431.42

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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.