Home / 21,865.75-30,101.74-20,861.47

Finding the Fourth Proportional to 21,865.75, 30,101.74 and 20,861.47

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Solution

The fourth proportional to 21,865.75, 30,101.74 and 20,861.47 is: 28,719.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,865.75 : 30,101.74 = 20,861.47 : x
  2. Step 2: Convert to fraction form
    21,865.75/30,101.74 = 20,861.47/x
  3. Step 3: Cross multiply
    21,865.75x = 30,101.74 × 20,861.47
  4. Step 4: Simplify right side
    21,865.75x = 627,966,545.96
  5. Step 5: Solve for x
    x = 627,966,545.96/21,865.75
  6. Step 6: Final answer
    x = 28,719.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.