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Finding the Fourth Proportional to 15,885.08, 21,921.38 and 8,715.04

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Solution

The fourth proportional to 15,885.08, 21,921.38 and 8,715.04 is: 12,026.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,885.08 : 21,921.38 = 8,715.04 : x
  2. Step 2: Convert to fraction form
    15,885.08/21,921.38 = 8,715.04/x
  3. Step 3: Cross multiply
    15,885.08x = 21,921.38 × 8,715.04
  4. Step 4: Simplify right side
    15,885.08x = 191,045,703.56
  5. Step 5: Solve for x
    x = 191,045,703.56/15,885.08
  6. Step 6: Final answer
    x = 12,026.74

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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.