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Finding the Fourth Proportional to 15,011.76, 20,711.16 and 8,718.96

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Solution

The fourth proportional to 15,011.76, 20,711.16 and 8,718.96 is: 12,029.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,011.76 : 20,711.16 = 8,718.96 : x
  2. Step 2: Convert to fraction form
    15,011.76/20,711.16 = 8,718.96/x
  3. Step 3: Cross multiply
    15,011.76x = 20,711.16 × 8,718.96
  4. Step 4: Simplify right side
    15,011.76x = 180,579,775.59
  5. Step 5: Solve for x
    x = 180,579,775.59/15,011.76
  6. Step 6: Final answer
    x = 12,029.22

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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.