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Finding the Fourth Proportional to 991.61, 1,368.73 and 618.37

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Solution

The fourth proportional to 991.61, 1,368.73 and 618.37 is: 853.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.61 : 1,368.73 = 618.37 : x
  2. Step 2: Convert to fraction form
    991.61/1,368.73 = 618.37/x
  3. Step 3: Cross multiply
    991.61x = 1,368.73 × 618.37
  4. Step 4: Simplify right side
    991.61x = 846,381.57
  5. Step 5: Solve for x
    x = 846,381.57/991.61
  6. Step 6: Final answer
    x = 853.54

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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.