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Finding the Fourth Proportional to 15,687, 21,647.90 and 8,613.26

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Solution

The fourth proportional to 15,687, 21,647.90 and 8,613.26 is: 11,886.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,687 : 21,647.90 = 8,613.26 : x
  2. Step 2: Convert to fraction form
    15,687/21,647.90 = 8,613.26/x
  3. Step 3: Cross multiply
    15,687x = 21,647.90 × 8,613.26
  4. Step 4: Simplify right side
    15,687x = 186,458,991.15
  5. Step 5: Solve for x
    x = 186,458,991.15/15,687
  6. Step 6: Final answer
    x = 11,886.21

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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.