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Finding the Fourth Proportional to 823.32, 1,136.31 and 528.90

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Solution

The fourth proportional to 823.32, 1,136.31 and 528.90 is: 729.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.32 : 1,136.31 = 528.90 : x
  2. Step 2: Convert to fraction form
    823.32/1,136.31 = 528.90/x
  3. Step 3: Cross multiply
    823.32x = 1,136.31 × 528.90
  4. Step 4: Simplify right side
    823.32x = 600,994.36
  5. Step 5: Solve for x
    x = 600,994.36/823.32
  6. Step 6: Final answer
    x = 729.96

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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.