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Finding the Fourth Proportional to 992.41, 1,368.93 and 660.49

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Solution

The fourth proportional to 992.41, 1,368.93 and 660.49 is: 911.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.41 : 1,368.93 = 660.49 : x
  2. Step 2: Convert to fraction form
    992.41/1,368.93 = 660.49/x
  3. Step 3: Cross multiply
    992.41x = 1,368.93 × 660.49
  4. Step 4: Simplify right side
    992.41x = 904,164.58
  5. Step 5: Solve for x
    x = 904,164.58/992.41
  6. Step 6: Final answer
    x = 911.08

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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.