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Finding the Fourth Proportional to 15,205.83, 20,983.84 and 8,491.57

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Solution

The fourth proportional to 15,205.83, 20,983.84 and 8,491.57 is: 11,718.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,205.83 : 20,983.84 = 8,491.57 : x
  2. Step 2: Convert to fraction form
    15,205.83/20,983.84 = 8,491.57/x
  3. Step 3: Cross multiply
    15,205.83x = 20,983.84 × 8,491.57
  4. Step 4: Simplify right side
    15,205.83x = 178,185,746.23
  5. Step 5: Solve for x
    x = 178,185,746.23/15,205.83
  6. Step 6: Final answer
    x = 11,718.25

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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.