Home / 21,280.79-31,921.11-6,489.68

Finding the Fourth Proportional to 21,280.79, 31,921.11 and 6,489.68

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Solution

The fourth proportional to 21,280.79, 31,921.11 and 6,489.68 is: 9,734.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,280.79 : 31,921.11 = 6,489.68 : x
  2. Step 2: Convert to fraction form
    21,280.79/31,921.11 = 6,489.68/x
  3. Step 3: Cross multiply
    21,280.79x = 31,921.11 × 6,489.68
  4. Step 4: Simplify right side
    21,280.79x = 207,157,629.54
  5. Step 5: Solve for x
    x = 207,157,629.54/21,280.79
  6. Step 6: Final answer
    x = 9,734.49

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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.