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Finding the Fourth Proportional to 21,297.35, 31,905.08 and 11,908.90

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Solution

The fourth proportional to 21,297.35, 31,905.08 and 11,908.90 is: 17,840.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,297.35 : 31,905.08 = 11,908.90 : x
  2. Step 2: Convert to fraction form
    21,297.35/31,905.08 = 11,908.90/x
  3. Step 3: Cross multiply
    21,297.35x = 31,905.08 × 11,908.90
  4. Step 4: Simplify right side
    21,297.35x = 379,954,407.21
  5. Step 5: Solve for x
    x = 379,954,407.21/21,297.35
  6. Step 6: Final answer
    x = 17,840.45

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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.