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Finding the Fourth Proportional to 21,008.89, 28,991.14 and 12,059.20

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Solution

The fourth proportional to 21,008.89, 28,991.14 and 12,059.20 is: 16,641.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008.89 : 28,991.14 = 12,059.20 : x
  2. Step 2: Convert to fraction form
    21,008.89/28,991.14 = 12,059.20/x
  3. Step 3: Cross multiply
    21,008.89x = 28,991.14 × 12,059.20
  4. Step 4: Simplify right side
    21,008.89x = 349,609,955.49
  5. Step 5: Solve for x
    x = 349,609,955.49/21,008.89
  6. Step 6: Final answer
    x = 16,641.05

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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.