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Finding the Fourth Proportional to 823.59, 1,136.51 and 492.02

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Solution

The fourth proportional to 823.59, 1,136.51 and 492.02 is: 678.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.59 : 1,136.51 = 492.02 : x
  2. Step 2: Convert to fraction form
    823.59/1,136.51 = 492.02/x
  3. Step 3: Cross multiply
    823.59x = 1,136.51 × 492.02
  4. Step 4: Simplify right side
    823.59x = 559,188.62
  5. Step 5: Solve for x
    x = 559,188.62/823.59
  6. Step 6: Final answer
    x = 678.96

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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.