Home / 21,240.40-31,856.34-20,186.59

Finding the Fourth Proportional to 21,240.40, 31,856.34 and 20,186.59

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Solution

The fourth proportional to 21,240.40, 31,856.34 and 20,186.59 is: 30,275.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,240.40 : 31,856.34 = 20,186.59 : x
  2. Step 2: Convert to fraction form
    21,240.40/31,856.34 = 20,186.59/x
  3. Step 3: Cross multiply
    21,240.40x = 31,856.34 × 20,186.59
  4. Step 4: Simplify right side
    21,240.40x = 643,070,874.48
  5. Step 5: Solve for x
    x = 643,070,874.48/21,240.40
  6. Step 6: Final answer
    x = 30,275.84

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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.