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Finding the Fourth Proportional to 1,355.49, 2,032.47 and 661.29

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Solution

The fourth proportional to 1,355.49, 2,032.47 and 661.29 is: 991.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.49 : 2,032.47 = 661.29 : x
  2. Step 2: Convert to fraction form
    1,355.49/2,032.47 = 661.29/x
  3. Step 3: Cross multiply
    1,355.49x = 2,032.47 × 661.29
  4. Step 4: Simplify right side
    1,355.49x = 1,344,052.09
  5. Step 5: Solve for x
    x = 1,344,052.09/1,355.49
  6. Step 6: Final answer
    x = 991.56

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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.