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Finding the Fourth Proportional to 992.05, 1,368.69 and 572.39

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Solution

The fourth proportional to 992.05, 1,368.69 and 572.39 is: 789.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.05 : 1,368.69 = 572.39 : x
  2. Step 2: Convert to fraction form
    992.05/1,368.69 = 572.39/x
  3. Step 3: Cross multiply
    992.05x = 1,368.69 × 572.39
  4. Step 4: Simplify right side
    992.05x = 783,424.47
  5. Step 5: Solve for x
    x = 783,424.47/992.05
  6. Step 6: Final answer
    x = 789.70

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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.