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Finding the Fourth Proportional to 725.20, 1,086.20 and 561.60

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Solution

The fourth proportional to 725.20, 1,086.20 and 561.60 is: 841.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.20 : 1,086.20 = 561.60 : x
  2. Step 2: Convert to fraction form
    725.20/1,086.20 = 561.60/x
  3. Step 3: Cross multiply
    725.20x = 1,086.20 × 561.60
  4. Step 4: Simplify right side
    725.20x = 610,009.92
  5. Step 5: Solve for x
    x = 610,009.92/725.20
  6. Step 6: Final answer
    x = 841.16

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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.