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Finding the Fourth Proportional to 15,903.89, 21,956.90 and 9,943.64

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Solution

The fourth proportional to 15,903.89, 21,956.90 and 9,943.64 is: 13,728.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,903.89 : 21,956.90 = 9,943.64 : x
  2. Step 2: Convert to fraction form
    15,903.89/21,956.90 = 9,943.64/x
  3. Step 3: Cross multiply
    15,903.89x = 21,956.90 × 9,943.64
  4. Step 4: Simplify right side
    15,903.89x = 218,331,459.40
  5. Step 5: Solve for x
    x = 218,331,459.40/15,903.89
  6. Step 6: Final answer
    x = 13,728.18

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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.