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Finding the Fourth Proportional to 1,568.76, 2,166.30 and 979.44

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Solution

The fourth proportional to 1,568.76, 2,166.30 and 979.44 is: 1,352.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,568.76 : 2,166.30 = 979.44 : x
  2. Step 2: Convert to fraction form
    1,568.76/2,166.30 = 979.44/x
  3. Step 3: Cross multiply
    1,568.76x = 2,166.30 × 979.44
  4. Step 4: Simplify right side
    1,568.76x = 2,121,760.87
  5. Step 5: Solve for x
    x = 2,121,760.87/1,568.76
  6. Step 6: Final answer
    x = 1,352.51

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1.5x scale

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.