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Finding the Fourth Proportional to 10,661.90, 15,992.96 and 8,685.23

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Solution

The fourth proportional to 10,661.90, 15,992.96 and 8,685.23 is: 13,027.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,661.90 : 15,992.96 = 8,685.23 : x
  2. Step 2: Convert to fraction form
    10,661.90/15,992.96 = 8,685.23/x
  3. Step 3: Cross multiply
    10,661.90x = 15,992.96 × 8,685.23
  4. Step 4: Simplify right side
    10,661.90x = 138,902,412.59
  5. Step 5: Solve for x
    x = 138,902,412.59/10,661.90
  6. Step 6: Final answer
    x = 13,027.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.