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Finding the Fourth Proportional to 754.79, 1,127.09 and 661.55

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Solution

The fourth proportional to 754.79, 1,127.09 and 661.55 is: 987.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.79 : 1,127.09 = 661.55 : x
  2. Step 2: Convert to fraction form
    754.79/1,127.09 = 661.55/x
  3. Step 3: Cross multiply
    754.79x = 1,127.09 × 661.55
  4. Step 4: Simplify right side
    754.79x = 745,622.41
  5. Step 5: Solve for x
    x = 745,622.41/754.79
  6. Step 6: Final answer
    x = 987.86

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.