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Finding the Fourth Proportional to 21,721, 32,581.88 and 8,573.28

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Solution

The fourth proportional to 21,721, 32,581.88 and 8,573.28 is: 12,860.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,721 : 32,581.88 = 8,573.28 : x
  2. Step 2: Convert to fraction form
    21,721/32,581.88 = 8,573.28/x
  3. Step 3: Cross multiply
    21,721x = 32,581.88 × 8,573.28
  4. Step 4: Simplify right side
    21,721x = 279,333,580.17
  5. Step 5: Solve for x
    x = 279,333,580.17/21,721
  6. Step 6: Final answer
    x = 12,860.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.