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Finding the Fourth Proportional to 21,657.79, 29,887.74 and 11,721.79

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Solution

The fourth proportional to 21,657.79, 29,887.74 and 11,721.79 is: 16,176.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,657.79 : 29,887.74 = 11,721.79 : x
  2. Step 2: Convert to fraction form
    21,657.79/29,887.74 = 11,721.79/x
  3. Step 3: Cross multiply
    21,657.79x = 29,887.74 × 11,721.79
  4. Step 4: Simplify right side
    21,657.79x = 350,337,662.42
  5. Step 5: Solve for x
    x = 350,337,662.42/21,657.79
  6. Step 6: Final answer
    x = 16,176.06

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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.