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Finding the Fourth Proportional to 20,490.87, 30,731.98 and 10,484.89

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Solution

The fourth proportional to 20,490.87, 30,731.98 and 10,484.89 is: 15,725.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.87 : 30,731.98 = 10,484.89 : x
  2. Step 2: Convert to fraction form
    20,490.87/30,731.98 = 10,484.89/x
  3. Step 3: Cross multiply
    20,490.87x = 30,731.98 × 10,484.89
  4. Step 4: Simplify right side
    20,490.87x = 322,221,548.76
  5. Step 5: Solve for x
    x = 322,221,548.76/20,490.87
  6. Step 6: Final answer
    x = 15,725.12

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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.