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Finding the Fourth Proportional to 21,080.70, 31,602.69 and 7,929.54

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Solution

The fourth proportional to 21,080.70, 31,602.69 and 7,929.54 is: 11,887.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,080.70 : 31,602.69 = 7,929.54 : x
  2. Step 2: Convert to fraction form
    21,080.70/31,602.69 = 7,929.54/x
  3. Step 3: Cross multiply
    21,080.70x = 31,602.69 × 7,929.54
  4. Step 4: Simplify right side
    21,080.70x = 250,594,794.46
  5. Step 5: Solve for x
    x = 250,594,794.46/21,080.70
  6. Step 6: Final answer
    x = 11,887.40

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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.