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Finding the Fourth Proportional to 611.96, 842.00 and 528.80

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Solution

The fourth proportional to 611.96, 842.00 and 528.80 is: 727.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.96 : 842.00 = 528.80 : x
  2. Step 2: Convert to fraction form
    611.96/842.00 = 528.80/x
  3. Step 3: Cross multiply
    611.96x = 842.00 × 528.80
  4. Step 4: Simplify right side
    611.96x = 445,242.75
  5. Step 5: Solve for x
    x = 445,242.75/611.96
  6. Step 6: Final answer
    x = 727.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.