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Finding the Fourth Proportional to 21,651.25, 29,878.73 and 11,715.25

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Solution

The fourth proportional to 21,651.25, 29,878.73 and 11,715.25 is: 16,167.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,651.25 : 29,878.73 = 11,715.25 : x
  2. Step 2: Convert to fraction form
    21,651.25/29,878.73 = 11,715.25/x
  3. Step 3: Cross multiply
    21,651.25x = 29,878.73 × 11,715.25
  4. Step 4: Simplify right side
    21,651.25x = 350,036,733.06
  5. Step 5: Solve for x
    x = 350,036,733.06/21,651.25
  6. Step 6: Final answer
    x = 16,167.05

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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.