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Finding the Fourth Proportional to 21,187.74, 29,239.74 and 11,757.18

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Solution

The fourth proportional to 21,187.74, 29,239.74 and 11,757.18 is: 16,225.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,187.74 : 29,239.74 = 11,757.18 : x
  2. Step 2: Convert to fraction form
    21,187.74/29,239.74 = 11,757.18/x
  3. Step 3: Cross multiply
    21,187.74x = 29,239.74 × 11,757.18
  4. Step 4: Simplify right side
    21,187.74x = 343,776,886.33
  5. Step 5: Solve for x
    x = 343,776,886.33/21,187.74
  6. Step 6: Final answer
    x = 16,225.27

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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.