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Finding the Fourth Proportional to 15,205.58, 20,981.85 and 8,491.58

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Solution

The fourth proportional to 15,205.58, 20,981.85 and 8,491.58 is: 11,717.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,205.58 : 20,981.85 = 8,491.58 : x
  2. Step 2: Convert to fraction form
    15,205.58/20,981.85 = 8,491.58/x
  3. Step 3: Cross multiply
    15,205.58x = 20,981.85 × 8,491.58
  4. Step 4: Simplify right side
    15,205.58x = 178,169,057.82
  5. Step 5: Solve for x
    x = 178,169,057.82/15,205.58
  6. Step 6: Final answer
    x = 11,717.35

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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.