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Finding the Fourth Proportional to 15,881.45, 21,916.58 and 8,807.99

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Solution

The fourth proportional to 15,881.45, 21,916.58 and 8,807.99 is: 12,155.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,881.45 : 21,916.58 = 8,807.99 : x
  2. Step 2: Convert to fraction form
    15,881.45/21,916.58 = 8,807.99/x
  3. Step 3: Cross multiply
    15,881.45x = 21,916.58 × 8,807.99
  4. Step 4: Simplify right side
    15,881.45x = 193,040,863.85
  5. Step 5: Solve for x
    x = 193,040,863.85/15,881.45
  6. Step 6: Final answer
    x = 12,155.12

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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.