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Finding the Fourth Proportional to 1,025.85, 1,540.53 and 979.68

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Solution

The fourth proportional to 1,025.85, 1,540.53 and 979.68 is: 1,471.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,025.85 : 1,540.53 = 979.68 : x
  2. Step 2: Convert to fraction form
    1,025.85/1,540.53 = 979.68/x
  3. Step 3: Cross multiply
    1,025.85x = 1,540.53 × 979.68
  4. Step 4: Simplify right side
    1,025.85x = 1,509,226.43
  5. Step 5: Solve for x
    x = 1,509,226.43/1,025.85
  6. Step 6: Final answer
    x = 1,471.20

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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.