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Finding the Fourth Proportional to 28,220.88, 38,946.03 and 15,645.63

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Solution

The fourth proportional to 28,220.88, 38,946.03 and 15,645.63 is: 21,591.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,220.88 : 38,946.03 = 15,645.63 : x
  2. Step 2: Convert to fraction form
    28,220.88/38,946.03 = 15,645.63/x
  3. Step 3: Cross multiply
    28,220.88x = 38,946.03 × 15,645.63
  4. Step 4: Simplify right side
    28,220.88x = 609,335,175.35
  5. Step 5: Solve for x
    x = 609,335,175.35/28,220.88
  6. Step 6: Final answer
    x = 21,591.64

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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.