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Finding the Fourth Proportional to 28,810, 39,757.80 and 15,562

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Solution

The fourth proportional to 28,810, 39,757.80 and 15,562 is: 21,475.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,810 : 39,757.80 = 15,562 : x
  2. Step 2: Convert to fraction form
    28,810/39,757.80 = 15,562/x
  3. Step 3: Cross multiply
    28,810x = 39,757.80 × 15,562
  4. Step 4: Simplify right side
    28,810x = 618,710,883.60
  5. Step 5: Solve for x
    x = 618,710,883.60/28,810
  6. Step 6: Final answer
    x = 21,475.56

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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.