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Finding the Fourth Proportional to 823.74, 1,136.66 and 487.70

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Solution

The fourth proportional to 823.74, 1,136.66 and 487.70 is: 672.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.74 : 1,136.66 = 487.70 : x
  2. Step 2: Convert to fraction form
    823.74/1,136.66 = 487.70/x
  3. Step 3: Cross multiply
    823.74x = 1,136.66 × 487.70
  4. Step 4: Simplify right side
    823.74x = 554,349.08
  5. Step 5: Solve for x
    x = 554,349.08/823.74
  6. Step 6: Final answer
    x = 672.97

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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.