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Finding the Fourth Proportional to 821.69, 1,133.92 and 490.13

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Solution

The fourth proportional to 821.69, 1,133.92 and 490.13 is: 676.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.69 : 1,133.92 = 490.13 : x
  2. Step 2: Convert to fraction form
    821.69/1,133.92 = 490.13/x
  3. Step 3: Cross multiply
    821.69x = 1,133.92 × 490.13
  4. Step 4: Simplify right side
    821.69x = 555,768.21
  5. Step 5: Solve for x
    x = 555,768.21/821.69
  6. Step 6: Final answer
    x = 676.37

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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.