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Finding the Fourth Proportional to 913.88, 1,260.91 and 618.64

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Solution

The fourth proportional to 913.88, 1,260.91 and 618.64 is: 853.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.88 : 1,260.91 = 618.64 : x
  2. Step 2: Convert to fraction form
    913.88/1,260.91 = 618.64/x
  3. Step 3: Cross multiply
    913.88x = 1,260.91 × 618.64
  4. Step 4: Simplify right side
    913.88x = 780,049.36
  5. Step 5: Solve for x
    x = 780,049.36/913.88
  6. Step 6: Final answer
    x = 853.56

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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.