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Finding the Fourth Proportional to 822.55, 1,136.56 and 658.12

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Solution

The fourth proportional to 822.55, 1,136.56 and 658.12 is: 909.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.55 : 1,136.56 = 658.12 : x
  2. Step 2: Convert to fraction form
    822.55/1,136.56 = 658.12/x
  3. Step 3: Cross multiply
    822.55x = 1,136.56 × 658.12
  4. Step 4: Simplify right side
    822.55x = 747,987.18
  5. Step 5: Solve for x
    x = 747,987.18/822.55
  6. Step 6: Final answer
    x = 909.36

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1.5x scale

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.