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Finding the Fourth Proportional to 1,045.60, 1,568.40 and 680.80

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Solution

The fourth proportional to 1,045.60, 1,568.40 and 680.80 is: 1,021.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,045.60 : 1,568.40 = 680.80 : x
  2. Step 2: Convert to fraction form
    1,045.60/1,568.40 = 680.80/x
  3. Step 3: Cross multiply
    1,045.60x = 1,568.40 × 680.80
  4. Step 4: Simplify right side
    1,045.60x = 1,067,766.72
  5. Step 5: Solve for x
    x = 1,067,766.72/1,045.60
  6. Step 6: Final answer
    x = 1,021.20

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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.