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Finding the Fourth Proportional to 992.55, 1,369.48 and 661.15

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Solution

The fourth proportional to 992.55, 1,369.48 and 661.15 is: 912.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.55 : 1,369.48 = 661.15 : x
  2. Step 2: Convert to fraction form
    992.55/1,369.48 = 661.15/x
  3. Step 3: Cross multiply
    992.55x = 1,369.48 × 661.15
  4. Step 4: Simplify right side
    992.55x = 905,431.70
  5. Step 5: Solve for x
    x = 905,431.70/992.55
  6. Step 6: Final answer
    x = 912.23

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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.