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Finding the Fourth Proportional to 3,112.29, 4,669.11 and 921.20

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Solution

The fourth proportional to 3,112.29, 4,669.11 and 921.20 is: 1,381.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,112.29 : 4,669.11 = 921.20 : x
  2. Step 2: Convert to fraction form
    3,112.29/4,669.11 = 921.20/x
  3. Step 3: Cross multiply
    3,112.29x = 4,669.11 × 921.20
  4. Step 4: Simplify right side
    3,112.29x = 4,301,160.79
  5. Step 5: Solve for x
    x = 4,301,160.79/3,112.29
  6. Step 6: Final answer
    x = 1,381.99

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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.