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Finding the Fourth Proportional to 15,353.78, 21,188.63 and 8,639.65

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Solution

The fourth proportional to 15,353.78, 21,188.63 and 8,639.65 is: 11,922.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,353.78 : 21,188.63 = 8,639.65 : x
  2. Step 2: Convert to fraction form
    15,353.78/21,188.63 = 8,639.65/x
  3. Step 3: Cross multiply
    15,353.78x = 21,188.63 × 8,639.65
  4. Step 4: Simplify right side
    15,353.78x = 183,062,315.81
  5. Step 5: Solve for x
    x = 183,062,315.81/15,353.78
  6. Step 6: Final answer
    x = 11,922.95

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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.