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Finding the Fourth Proportional to 1,308.51, 1,962.77 and 821.90

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Solution

The fourth proportional to 1,308.51, 1,962.77 and 821.90 is: 1,232.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.51 : 1,962.77 = 821.90 : x
  2. Step 2: Convert to fraction form
    1,308.51/1,962.77 = 821.90/x
  3. Step 3: Cross multiply
    1,308.51x = 1,962.77 × 821.90
  4. Step 4: Simplify right side
    1,308.51x = 1,613,201.46
  5. Step 5: Solve for x
    x = 1,613,201.46/1,308.51
  6. Step 6: Final answer
    x = 1,232.85

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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.