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Finding the Fourth Proportional to 15,912.48, 21,959.06 and 8,644.52

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Solution

The fourth proportional to 15,912.48, 21,959.06 and 8,644.52 is: 11,929.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,912.48 : 21,959.06 = 8,644.52 : x
  2. Step 2: Convert to fraction form
    15,912.48/21,959.06 = 8,644.52/x
  3. Step 3: Cross multiply
    15,912.48x = 21,959.06 × 8,644.52
  4. Step 4: Simplify right side
    15,912.48x = 189,825,533.35
  5. Step 5: Solve for x
    x = 189,825,533.35/15,912.48
  6. Step 6: Final answer
    x = 11,929.35

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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.