Home / 7,278.94-10,921.69-3,120.04

Finding the Fourth Proportional to 7,278.94, 10,921.69 and 3,120.04

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Solution

The fourth proportional to 7,278.94, 10,921.69 and 3,120.04 is: 4,681.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,278.94 : 10,921.69 = 3,120.04 : x
  2. Step 2: Convert to fraction form
    7,278.94/10,921.69 = 3,120.04/x
  3. Step 3: Cross multiply
    7,278.94x = 10,921.69 × 3,120.04
  4. Step 4: Simplify right side
    7,278.94x = 34,076,109.67
  5. Step 5: Solve for x
    x = 34,076,109.67/7,278.94
  6. Step 6: Final answer
    x = 4,681.47

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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.