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Finding the Fourth Proportional to 561.40, 842.24 and 355.68

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Solution

The fourth proportional to 561.40, 842.24 and 355.68 is: 533.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.40 : 842.24 = 355.68 : x
  2. Step 2: Convert to fraction form
    561.40/842.24 = 355.68/x
  3. Step 3: Cross multiply
    561.40x = 842.24 × 355.68
  4. Step 4: Simplify right side
    561.40x = 299,568.81
  5. Step 5: Solve for x
    x = 299,568.81/561.40
  6. Step 6: Final answer
    x = 533.61

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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.