Home / 3,120.96-4,680.96-929.28

Finding the Fourth Proportional to 3,120.96, 4,680.96 and 929.28

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Solution

The fourth proportional to 3,120.96, 4,680.96 and 929.28 is: 1,393.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,120.96 : 4,680.96 = 929.28 : x
  2. Step 2: Convert to fraction form
    3,120.96/4,680.96 = 929.28/x
  3. Step 3: Cross multiply
    3,120.96x = 4,680.96 × 929.28
  4. Step 4: Simplify right side
    3,120.96x = 4,349,922.51
  5. Step 5: Solve for x
    x = 4,349,922.51/3,120.96
  6. Step 6: Final answer
    x = 1,393.78

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Similar ratio
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1.5x scale

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.