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Finding the Fourth Proportional to 992.67, 1,370.46 and 661.56

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Solution

The fourth proportional to 992.67, 1,370.46 and 661.56 is: 913.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.67 : 1,370.46 = 661.56 : x
  2. Step 2: Convert to fraction form
    992.67/1,370.46 = 661.56/x
  3. Step 3: Cross multiply
    992.67x = 1,370.46 × 661.56
  4. Step 4: Simplify right side
    992.67x = 906,641.52
  5. Step 5: Solve for x
    x = 906,641.52/992.67
  6. Step 6: Final answer
    x = 913.34

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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.