Home / 28,031.28-38,685.90-20,945.40

Finding the Fourth Proportional to 28,031.28, 38,685.90 and 20,945.40

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Solution

The fourth proportional to 28,031.28, 38,685.90 and 20,945.40 is: 28,906.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,031.28 : 38,685.90 = 20,945.40 : x
  2. Step 2: Convert to fraction form
    28,031.28/38,685.90 = 20,945.40/x
  3. Step 3: Cross multiply
    28,031.28x = 38,685.90 × 20,945.40
  4. Step 4: Simplify right side
    28,031.28x = 810,291,649.86
  5. Step 5: Solve for x
    x = 810,291,649.86/28,031.28
  6. Step 6: Final answer
    x = 28,906.69

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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.