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Finding the Fourth Proportional to 10,620.72, 15,905.57 and 5,929.20

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Solution

The fourth proportional to 10,620.72, 15,905.57 and 5,929.20 is: 8,879.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,620.72 : 15,905.57 = 5,929.20 : x
  2. Step 2: Convert to fraction form
    10,620.72/15,905.57 = 5,929.20/x
  3. Step 3: Cross multiply
    10,620.72x = 15,905.57 × 5,929.20
  4. Step 4: Simplify right side
    10,620.72x = 94,307,276.00
  5. Step 5: Solve for x
    x = 94,307,276.00/10,620.72
  6. Step 6: Final answer
    x = 8,879.56

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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.