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Finding the Fourth Proportional to 15,691.17, 21,653.06 and 8,520.92

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Solution

The fourth proportional to 15,691.17, 21,653.06 and 8,520.92 is: 11,758.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,691.17 : 21,653.06 = 8,520.92 : x
  2. Step 2: Convert to fraction form
    15,691.17/21,653.06 = 8,520.92/x
  3. Step 3: Cross multiply
    15,691.17x = 21,653.06 × 8,520.92
  4. Step 4: Simplify right side
    15,691.17x = 184,503,841.15
  5. Step 5: Solve for x
    x = 184,503,841.15/15,691.17
  6. Step 6: Final answer
    x = 11,758.45

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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.