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Finding the Fourth Proportional to 15,355.76, 21,184.94 and 8,639.88

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Solution

The fourth proportional to 15,355.76, 21,184.94 and 8,639.88 is: 11,919.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,355.76 : 21,184.94 = 8,639.88 : x
  2. Step 2: Convert to fraction form
    15,355.76/21,184.94 = 8,639.88/x
  3. Step 3: Cross multiply
    15,355.76x = 21,184.94 × 8,639.88
  4. Step 4: Simplify right side
    15,355.76x = 183,035,339.41
  5. Step 5: Solve for x
    x = 183,035,339.41/15,355.76
  6. Step 6: Final answer
    x = 11,919.65

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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.