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Finding the Fourth Proportional to 21,657.70, 29,887.70 and 11,721.70

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Solution

The fourth proportional to 21,657.70, 29,887.70 and 11,721.70 is: 16,175.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,657.70 : 29,887.70 = 11,721.70 : x
  2. Step 2: Convert to fraction form
    21,657.70/29,887.70 = 11,721.70/x
  3. Step 3: Cross multiply
    21,657.70x = 29,887.70 × 11,721.70
  4. Step 4: Simplify right side
    21,657.70x = 350,334,653.09
  5. Step 5: Solve for x
    x = 350,334,653.09/21,657.70
  6. Step 6: Final answer
    x = 16,175.99

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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.