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Finding the Fourth Proportional to 8,618.71, 11,898.81 and 5,639.74

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Solution

The fourth proportional to 8,618.71, 11,898.81 and 5,639.74 is: 7,786.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,618.71 : 11,898.81 = 5,639.74 : x
  2. Step 2: Convert to fraction form
    8,618.71/11,898.81 = 5,639.74/x
  3. Step 3: Cross multiply
    8,618.71x = 11,898.81 × 5,639.74
  4. Step 4: Simplify right side
    8,618.71x = 67,106,194.71
  5. Step 5: Solve for x
    x = 67,106,194.71/8,618.71
  6. Step 6: Final answer
    x = 7,786.11

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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.