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Finding the Fourth Proportional to 15,891.61, 21,921.30 and 9,912.90

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Solution

The fourth proportional to 15,891.61, 21,921.30 and 9,912.90 is: 13,674.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,891.61 : 21,921.30 = 9,912.90 : x
  2. Step 2: Convert to fraction form
    15,891.61/21,921.30 = 9,912.90/x
  3. Step 3: Cross multiply
    15,891.61x = 21,921.30 × 9,912.90
  4. Step 4: Simplify right side
    15,891.61x = 217,303,654.77
  5. Step 5: Solve for x
    x = 217,303,654.77/15,891.61
  6. Step 6: Final answer
    x = 13,674.11

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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.