Home / 18,918.64-28,376.20-8,921.08

Finding the Fourth Proportional to 18,918.64, 28,376.20 and 8,921.08

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Solution

The fourth proportional to 18,918.64, 28,376.20 and 8,921.08 is: 13,380.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.64 : 28,376.20 = 8,921.08 : x
  2. Step 2: Convert to fraction form
    18,918.64/28,376.20 = 8,921.08/x
  3. Step 3: Cross multiply
    18,918.64x = 28,376.20 × 8,921.08
  4. Step 4: Simplify right side
    18,918.64x = 253,146,350.30
  5. Step 5: Solve for x
    x = 253,146,350.30/18,918.64
  6. Step 6: Final answer
    x = 13,380.79

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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.