Home / 5,280.49-7,912.51-1,991.78

Finding the Fourth Proportional to 5,280.49, 7,912.51 and 1,991.78

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Solution

The fourth proportional to 5,280.49, 7,912.51 and 1,991.78 is: 2,984.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,280.49 : 7,912.51 = 1,991.78 : x
  2. Step 2: Convert to fraction form
    5,280.49/7,912.51 = 1,991.78/x
  3. Step 3: Cross multiply
    5,280.49x = 7,912.51 × 1,991.78
  4. Step 4: Simplify right side
    5,280.49x = 15,759,979.17
  5. Step 5: Solve for x
    x = 15,759,979.17/5,280.49
  6. Step 6: Final answer
    x = 2,984.57

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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.