Home / 20,733.40-31,100.10-11,985.40

Finding the Fourth Proportional to 20,733.40, 31,100.10 and 11,985.40

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Solution

The fourth proportional to 20,733.40, 31,100.10 and 11,985.40 is: 17,978.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,733.40 : 31,100.10 = 11,985.40 : x
  2. Step 2: Convert to fraction form
    20,733.40/31,100.10 = 11,985.40/x
  3. Step 3: Cross multiply
    20,733.40x = 31,100.10 × 11,985.40
  4. Step 4: Simplify right side
    20,733.40x = 372,747,138.54
  5. Step 5: Solve for x
    x = 372,747,138.54/20,733.40
  6. Step 6: Final answer
    x = 17,978.10

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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.