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Finding the Fourth Proportional to 20,755.40, 28,642.50 and 11,802.68

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Solution

The fourth proportional to 20,755.40, 28,642.50 and 11,802.68 is: 16,287.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,755.40 : 28,642.50 = 11,802.68 : x
  2. Step 2: Convert to fraction form
    20,755.40/28,642.50 = 11,802.68/x
  3. Step 3: Cross multiply
    20,755.40x = 28,642.50 × 11,802.68
  4. Step 4: Simplify right side
    20,755.40x = 338,058,261.90
  5. Step 5: Solve for x
    x = 338,058,261.90/20,755.40
  6. Step 6: Final answer
    x = 16,287.73

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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.