Home / 1,568.40-2,165.12-979.32

Finding the Fourth Proportional to 1,568.40, 2,165.12 and 979.32

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Solution

The fourth proportional to 1,568.40, 2,165.12 and 979.32 is: 1,351.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,568.40 : 2,165.12 = 979.32 : x
  2. Step 2: Convert to fraction form
    1,568.40/2,165.12 = 979.32/x
  3. Step 3: Cross multiply
    1,568.40x = 2,165.12 × 979.32
  4. Step 4: Simplify right side
    1,568.40x = 2,120,345.32
  5. Step 5: Solve for x
    x = 2,120,345.32/1,568.40
  6. Step 6: Final answer
    x = 1,351.92

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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.