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Finding the Fourth Proportional to 28,503.78, 39,335.67 and 15,929.34

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Solution

The fourth proportional to 28,503.78, 39,335.67 and 15,929.34 is: 21,982.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,503.78 : 39,335.67 = 15,929.34 : x
  2. Step 2: Convert to fraction form
    28,503.78/39,335.67 = 15,929.34/x
  3. Step 3: Cross multiply
    28,503.78x = 39,335.67 × 15,929.34
  4. Step 4: Simplify right side
    28,503.78x = 626,591,261.56
  5. Step 5: Solve for x
    x = 626,591,261.56/28,503.78
  6. Step 6: Final answer
    x = 21,982.74

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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.