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Finding the Fourth Proportional to 15,691.90, 21,660.99 and 9,403.06

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Solution

The fourth proportional to 15,691.90, 21,660.99 and 9,403.06 is: 12,979.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,691.90 : 21,660.99 = 9,403.06 : x
  2. Step 2: Convert to fraction form
    15,691.90/21,660.99 = 9,403.06/x
  3. Step 3: Cross multiply
    15,691.90x = 21,660.99 × 9,403.06
  4. Step 4: Simplify right side
    15,691.90x = 203,679,588.63
  5. Step 5: Solve for x
    x = 203,679,588.63/15,691.90
  6. Step 6: Final answer
    x = 12,979.92

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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.