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Finding the Fourth Proportional to 561.40, 842.82 and 440.08

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Solution

The fourth proportional to 561.40, 842.82 and 440.08 is: 660.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.40 : 842.82 = 440.08 : x
  2. Step 2: Convert to fraction form
    561.40/842.82 = 440.08/x
  3. Step 3: Cross multiply
    561.40x = 842.82 × 440.08
  4. Step 4: Simplify right side
    561.40x = 370,908.23
  5. Step 5: Solve for x
    x = 370,908.23/561.40
  6. Step 6: Final answer
    x = 660.68

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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.