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Finding the Fourth Proportional to 992.13, 1,368.81 and 618.81

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Solution

The fourth proportional to 992.13, 1,368.81 and 618.81 is: 853.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.13 : 1,368.81 = 618.81 : x
  2. Step 2: Convert to fraction form
    992.13/1,368.81 = 618.81/x
  3. Step 3: Cross multiply
    992.13x = 1,368.81 × 618.81
  4. Step 4: Simplify right side
    992.13x = 847,033.32
  5. Step 5: Solve for x
    x = 847,033.32/992.13
  6. Step 6: Final answer
    x = 853.75

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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.