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Finding the Fourth Proportional to 1,127.22, 1,555.29 and 661.38

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Solution

The fourth proportional to 1,127.22, 1,555.29 and 661.38 is: 912.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.22 : 1,555.29 = 661.38 : x
  2. Step 2: Convert to fraction form
    1,127.22/1,555.29 = 661.38/x
  3. Step 3: Cross multiply
    1,127.22x = 1,555.29 × 661.38
  4. Step 4: Simplify right side
    1,127.22x = 1,028,637.70
  5. Step 5: Solve for x
    x = 1,028,637.70/1,127.22
  6. Step 6: Final answer
    x = 912.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.