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Finding the Fourth Proportional to 21,657.76, 29,887.72 and 11,721.76

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Solution

The fourth proportional to 21,657.76, 29,887.72 and 11,721.76 is: 16,176.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,657.76 : 29,887.72 = 11,721.76 : x
  2. Step 2: Convert to fraction form
    21,657.76/29,887.72 = 11,721.76/x
  3. Step 3: Cross multiply
    21,657.76x = 29,887.72 × 11,721.76
  4. Step 4: Simplify right side
    21,657.76x = 350,336,680.79
  5. Step 5: Solve for x
    x = 350,336,680.79/21,657.76
  6. Step 6: Final answer
    x = 16,176.03

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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.