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Finding the Fourth Proportional to 21,309.76, 29,406.88 and 11,878.08

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Solution

The fourth proportional to 21,309.76, 29,406.88 and 11,878.08 is: 16,391.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,309.76 : 29,406.88 = 11,878.08 : x
  2. Step 2: Convert to fraction form
    21,309.76/29,406.88 = 11,878.08/x
  3. Step 3: Cross multiply
    21,309.76x = 29,406.88 × 11,878.08
  4. Step 4: Simplify right side
    21,309.76x = 349,297,273.19
  5. Step 5: Solve for x
    x = 349,297,273.19/21,309.76
  6. Step 6: Final answer
    x = 16,391.42

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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.