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Finding the Fourth Proportional to 561.47, 842.40 and 287.49

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Solution

The fourth proportional to 561.47, 842.40 and 287.49 is: 431.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.47 : 842.40 = 287.49 : x
  2. Step 2: Convert to fraction form
    561.47/842.40 = 287.49/x
  3. Step 3: Cross multiply
    561.47x = 842.40 × 287.49
  4. Step 4: Simplify right side
    561.47x = 242,180.14
  5. Step 5: Solve for x
    x = 242,180.14/561.47
  6. Step 6: Final answer
    x = 431.33

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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.