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Finding the Fourth Proportional to 14,507.61, 20,031.80 and 11,145.09

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Solution

The fourth proportional to 14,507.61, 20,031.80 and 11,145.09 is: 15,388.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,507.61 : 20,031.80 = 11,145.09 : x
  2. Step 2: Convert to fraction form
    14,507.61/20,031.80 = 11,145.09/x
  3. Step 3: Cross multiply
    14,507.61x = 20,031.80 × 11,145.09
  4. Step 4: Simplify right side
    14,507.61x = 223,256,213.86
  5. Step 5: Solve for x
    x = 223,256,213.86/14,507.61
  6. Step 6: Final answer
    x = 15,388.90

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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.