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Finding the Fourth Proportional to 28,907.78, 39,892.74 and 15,659.78

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Solution

The fourth proportional to 28,907.78, 39,892.74 and 15,659.78 is: 21,610.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,907.78 : 39,892.74 = 15,659.78 : x
  2. Step 2: Convert to fraction form
    28,907.78/39,892.74 = 15,659.78/x
  3. Step 3: Cross multiply
    28,907.78x = 39,892.74 × 15,659.78
  4. Step 4: Simplify right side
    28,907.78x = 624,711,532.00
  5. Step 5: Solve for x
    x = 624,711,532.00/28,907.78
  6. Step 6: Final answer
    x = 21,610.50

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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.