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Finding the Fourth Proportional to 21,887.60, 32,755.80 and 13,128.80

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Solution

The fourth proportional to 21,887.60, 32,755.80 and 13,128.80 is: 19,647.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,887.60 : 32,755.80 = 13,128.80 : x
  2. Step 2: Convert to fraction form
    21,887.60/32,755.80 = 13,128.80/x
  3. Step 3: Cross multiply
    21,887.60x = 32,755.80 × 13,128.80
  4. Step 4: Simplify right side
    21,887.60x = 430,044,347.04
  5. Step 5: Solve for x
    x = 430,044,347.04/21,887.60
  6. Step 6: Final answer
    x = 19,647.85

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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.