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Finding the Fourth Proportional to 15,690.72, 21,654 and 8,617.44

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Solution

The fourth proportional to 15,690.72, 21,654 and 8,617.44 is: 11,892.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,690.72 : 21,654 = 8,617.44 : x
  2. Step 2: Convert to fraction form
    15,690.72/21,654 = 8,617.44/x
  3. Step 3: Cross multiply
    15,690.72x = 21,654 × 8,617.44
  4. Step 4: Simplify right side
    15,690.72x = 186,602,045.76
  5. Step 5: Solve for x
    x = 186,602,045.76/15,690.72
  6. Step 6: Final answer
    x = 11,892.51

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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.