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Finding the Fourth Proportional to 15,005.80, 20,709.26 and 8,717.80

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Solution

The fourth proportional to 15,005.80, 20,709.26 and 8,717.80 is: 12,031.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,005.80 : 20,709.26 = 8,717.80 : x
  2. Step 2: Convert to fraction form
    15,005.80/20,709.26 = 8,717.80/x
  3. Step 3: Cross multiply
    15,005.80x = 20,709.26 × 8,717.80
  4. Step 4: Simplify right side
    15,005.80x = 180,539,186.83
  5. Step 5: Solve for x
    x = 180,539,186.83/15,005.80
  6. Step 6: Final answer
    x = 12,031.29

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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.