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Finding the Fourth Proportional to 3,129.56, 4,693.97 and 821.24

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Solution

The fourth proportional to 3,129.56, 4,693.97 and 821.24 is: 1,231.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,129.56 : 4,693.97 = 821.24 : x
  2. Step 2: Convert to fraction form
    3,129.56/4,693.97 = 821.24/x
  3. Step 3: Cross multiply
    3,129.56x = 4,693.97 × 821.24
  4. Step 4: Simplify right side
    3,129.56x = 3,854,854.51
  5. Step 5: Solve for x
    x = 3,854,854.51/3,129.56
  6. Step 6: Final answer
    x = 1,231.76

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1.5x scale

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.