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Finding the Fourth Proportional to 823.61, 1,136.42 and 528.84

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Solution

The fourth proportional to 823.61, 1,136.42 and 528.84 is: 729.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.61 : 1,136.42 = 528.84 : x
  2. Step 2: Convert to fraction form
    823.61/1,136.42 = 528.84/x
  3. Step 3: Cross multiply
    823.61x = 1,136.42 × 528.84
  4. Step 4: Simplify right side
    823.61x = 600,984.35
  5. Step 5: Solve for x
    x = 600,984.35/823.61
  6. Step 6: Final answer
    x = 729.70

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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.