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Finding the Fourth Proportional to 29,028.50, 40,059.36 and 15,780.50

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Solution

The fourth proportional to 29,028.50, 40,059.36 and 15,780.50 is: 21,777.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,028.50 : 40,059.36 = 15,780.50 : x
  2. Step 2: Convert to fraction form
    29,028.50/40,059.36 = 15,780.50/x
  3. Step 3: Cross multiply
    29,028.50x = 40,059.36 × 15,780.50
  4. Step 4: Simplify right side
    29,028.50x = 632,156,730.48
  5. Step 5: Solve for x
    x = 632,156,730.48/29,028.50
  6. Step 6: Final answer
    x = 21,777.11

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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.