Home / 7,921.28-11,878.64-2,990.08

Finding the Fourth Proportional to 7,921.28, 11,878.64 and 2,990.08

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Solution

The fourth proportional to 7,921.28, 11,878.64 and 2,990.08 is: 4,483.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,921.28 : 11,878.64 = 2,990.08 : x
  2. Step 2: Convert to fraction form
    7,921.28/11,878.64 = 2,990.08/x
  3. Step 3: Cross multiply
    7,921.28x = 11,878.64 × 2,990.08
  4. Step 4: Simplify right side
    7,921.28x = 35,518,083.89
  5. Step 5: Solve for x
    x = 35,518,083.89/7,921.28
  6. Step 6: Final answer
    x = 4,483.88

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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.