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Finding the Fourth Proportional to 28,808, 39,755.04 and 15,560

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Solution

The fourth proportional to 28,808, 39,755.04 and 15,560 is: 21,472.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,808 : 39,755.04 = 15,560 : x
  2. Step 2: Convert to fraction form
    28,808/39,755.04 = 15,560/x
  3. Step 3: Cross multiply
    28,808x = 39,755.04 × 15,560
  4. Step 4: Simplify right side
    28,808x = 618,588,422.40
  5. Step 5: Solve for x
    x = 618,588,422.40/28,808
  6. Step 6: Final answer
    x = 21,472.80

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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.