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Finding the Fourth Proportional to 992.86, 1,369.39 and 661.72

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Solution

The fourth proportional to 992.86, 1,369.39 and 661.72 is: 912.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.86 : 1,369.39 = 661.72 : x
  2. Step 2: Convert to fraction form
    992.86/1,369.39 = 661.72/x
  3. Step 3: Cross multiply
    992.86x = 1,369.39 × 661.72
  4. Step 4: Simplify right side
    992.86x = 906,151.48
  5. Step 5: Solve for x
    x = 906,151.48/992.86
  6. Step 6: Final answer
    x = 912.67

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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.