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Finding the Fourth Proportional to 677.60, 1,016.40 and 618.20

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Solution

The fourth proportional to 677.60, 1,016.40 and 618.20 is: 927.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.60 : 1,016.40 = 618.20 : x
  2. Step 2: Convert to fraction form
    677.60/1,016.40 = 618.20/x
  3. Step 3: Cross multiply
    677.60x = 1,016.40 × 618.20
  4. Step 4: Simplify right side
    677.60x = 628,338.48
  5. Step 5: Solve for x
    x = 628,338.48/677.60
  6. Step 6: Final answer
    x = 927.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.