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Finding the Fourth Proportional to 21,656.68, 32,528.70 and 12,908.68

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Solution

The fourth proportional to 21,656.68, 32,528.70 and 12,908.68 is: 19,389.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,656.68 : 32,528.70 = 12,908.68 : x
  2. Step 2: Convert to fraction form
    21,656.68/32,528.70 = 12,908.68/x
  3. Step 3: Cross multiply
    21,656.68x = 32,528.70 × 12,908.68
  4. Step 4: Simplify right side
    21,656.68x = 419,902,579.12
  5. Step 5: Solve for x
    x = 419,902,579.12/21,656.68
  6. Step 6: Final answer
    x = 19,389.06

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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.