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Finding the Fourth Proportional to 15,145.91, 20,909.56 and 10,622.48

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Solution

The fourth proportional to 15,145.91, 20,909.56 and 10,622.48 is: 14,664.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,145.91 : 20,909.56 = 10,622.48 : x
  2. Step 2: Convert to fraction form
    15,145.91/20,909.56 = 10,622.48/x
  3. Step 3: Cross multiply
    15,145.91x = 20,909.56 × 10,622.48
  4. Step 4: Simplify right side
    15,145.91x = 222,111,329.80
  5. Step 5: Solve for x
    x = 222,111,329.80/15,145.91
  6. Step 6: Final answer
    x = 14,664.77

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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.