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Finding the Fourth Proportional to 1,335.08, 2,002.62 and 821

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Solution

The fourth proportional to 1,335.08, 2,002.62 and 821 is: 1,231.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,335.08 : 2,002.62 = 821 : x
  2. Step 2: Convert to fraction form
    1,335.08/2,002.62 = 821/x
  3. Step 3: Cross multiply
    1,335.08x = 2,002.62 × 821
  4. Step 4: Simplify right side
    1,335.08x = 1,644,151.02
  5. Step 5: Solve for x
    x = 1,644,151.02/1,335.08
  6. Step 6: Final answer
    x = 1,231.50

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.