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Finding the Fourth Proportional to 992.76, 1,368.91 and 812.76

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Solution

The fourth proportional to 992.76, 1,368.91 and 812.76 is: 1,120.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.76 : 1,368.91 = 812.76 : x
  2. Step 2: Convert to fraction form
    992.76/1,368.91 = 812.76/x
  3. Step 3: Cross multiply
    992.76x = 1,368.91 × 812.76
  4. Step 4: Simplify right side
    992.76x = 1,112,595.29
  5. Step 5: Solve for x
    x = 1,112,595.29/992.76
  6. Step 6: Final answer
    x = 1,120.71

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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.