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Finding the Fourth Proportional to 15,012.71, 20,719.59 and 8,639.17

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Solution

The fourth proportional to 15,012.71, 20,719.59 and 8,639.17 is: 11,923.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,012.71 : 20,719.59 = 8,639.17 : x
  2. Step 2: Convert to fraction form
    15,012.71/20,719.59 = 8,639.17/x
  3. Step 3: Cross multiply
    15,012.71x = 20,719.59 × 8,639.17
  4. Step 4: Simplify right side
    15,012.71x = 179,000,040.94
  5. Step 5: Solve for x
    x = 179,000,040.94/15,012.71
  6. Step 6: Final answer
    x = 11,923.24

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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.