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Finding the Fourth Proportional to 28,905.50, 39,889.59 and 15,657.50

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Solution

The fourth proportional to 28,905.50, 39,889.59 and 15,657.50 is: 21,607.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,905.50 : 39,889.59 = 15,657.50 : x
  2. Step 2: Convert to fraction form
    28,905.50/39,889.59 = 15,657.50/x
  3. Step 3: Cross multiply
    28,905.50x = 39,889.59 × 15,657.50
  4. Step 4: Simplify right side
    28,905.50x = 624,571,255.43
  5. Step 5: Solve for x
    x = 624,571,255.43/28,905.50
  6. Step 6: Final answer
    x = 21,607.35

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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.