Home / 20,108.79-27,750.20-11,156.40

Finding the Fourth Proportional to 20,108.79, 27,750.20 and 11,156.40

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Solution

The fourth proportional to 20,108.79, 27,750.20 and 11,156.40 is: 15,395.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,108.79 : 27,750.20 = 11,156.40 : x
  2. Step 2: Convert to fraction form
    20,108.79/27,750.20 = 11,156.40/x
  3. Step 3: Cross multiply
    20,108.79x = 27,750.20 × 11,156.40
  4. Step 4: Simplify right side
    20,108.79x = 309,592,275.50
  5. Step 5: Solve for x
    x = 309,592,275.50/20,108.79
  6. Step 6: Final answer
    x = 15,395.87

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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.