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Finding the Fourth Proportional to 823.71, 1,136.70 and 474.39

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Solution

The fourth proportional to 823.71, 1,136.70 and 474.39 is: 654.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.71 : 1,136.70 = 474.39 : x
  2. Step 2: Convert to fraction form
    823.71/1,136.70 = 474.39/x
  3. Step 3: Cross multiply
    823.71x = 1,136.70 × 474.39
  4. Step 4: Simplify right side
    823.71x = 539,239.11
  5. Step 5: Solve for x
    x = 539,239.11/823.71
  6. Step 6: Final answer
    x = 654.65

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Double scale
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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.