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Finding the Fourth Proportional to 7,281.25, 10,921.88 and 1,809.25

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Solution

The fourth proportional to 7,281.25, 10,921.88 and 1,809.25 is: 2,713.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,281.25 : 10,921.88 = 1,809.25 : x
  2. Step 2: Convert to fraction form
    7,281.25/10,921.88 = 1,809.25/x
  3. Step 3: Cross multiply
    7,281.25x = 10,921.88 × 1,809.25
  4. Step 4: Simplify right side
    7,281.25x = 19,760,411.39
  5. Step 5: Solve for x
    x = 19,760,411.39/7,281.25
  6. Step 6: Final answer
    x = 2,713.88

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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.