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Finding the Fourth Proportional to 823.49, 1,135.56 and 646.13

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Solution

The fourth proportional to 823.49, 1,135.56 and 646.13 is: 890.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.49 : 1,135.56 = 646.13 : x
  2. Step 2: Convert to fraction form
    823.49/1,135.56 = 646.13/x
  3. Step 3: Cross multiply
    823.49x = 1,135.56 × 646.13
  4. Step 4: Simplify right side
    823.49x = 733,713.71
  5. Step 5: Solve for x
    x = 733,713.71/823.49
  6. Step 6: Final answer
    x = 890.99

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Half scale
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Double scale
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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.