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Finding the Fourth Proportional to 21,063.59, 31,579.79 and 9,957.30

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Solution

The fourth proportional to 21,063.59, 31,579.79 and 9,957.30 is: 14,928.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,063.59 : 31,579.79 = 9,957.30 : x
  2. Step 2: Convert to fraction form
    21,063.59/31,579.79 = 9,957.30/x
  3. Step 3: Cross multiply
    21,063.59x = 31,579.79 × 9,957.30
  4. Step 4: Simplify right side
    21,063.59x = 314,449,511.60
  5. Step 5: Solve for x
    x = 314,449,511.60/21,063.59
  6. Step 6: Final answer
    x = 14,928.58

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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.