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Finding the Fourth Proportional to 15,916.71, 21,964.96 and 8,648.74

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Solution

The fourth proportional to 15,916.71, 21,964.96 and 8,648.74 is: 11,935.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,916.71 : 21,964.96 = 8,648.74 : x
  2. Step 2: Convert to fraction form
    15,916.71/21,964.96 = 8,648.74/x
  3. Step 3: Cross multiply
    15,916.71x = 21,964.96 × 8,648.74
  4. Step 4: Simplify right side
    15,916.71x = 189,969,228.15
  5. Step 5: Solve for x
    x = 189,969,228.15/15,916.71
  6. Step 6: Final answer
    x = 11,935.21

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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.