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Finding the Fourth Proportional to 21,623.70, 29,840.69 and 11,687.70

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Solution

The fourth proportional to 21,623.70, 29,840.69 and 11,687.70 is: 16,129.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,623.70 : 29,840.69 = 11,687.70 : x
  2. Step 2: Convert to fraction form
    21,623.70/29,840.69 = 11,687.70/x
  3. Step 3: Cross multiply
    21,623.70x = 29,840.69 × 11,687.70
  4. Step 4: Simplify right side
    21,623.70x = 348,769,032.51
  5. Step 5: Solve for x
    x = 348,769,032.51/21,623.70
  6. Step 6: Final answer
    x = 16,129.02

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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.