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Finding the Fourth Proportional to 21,641.64, 29,865.45 and 11,705.64

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Solution

The fourth proportional to 21,641.64, 29,865.45 and 11,705.64 is: 16,153.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,641.64 : 29,865.45 = 11,705.64 : x
  2. Step 2: Convert to fraction form
    21,641.64/29,865.45 = 11,705.64/x
  3. Step 3: Cross multiply
    21,641.64x = 29,865.45 × 11,705.64
  4. Step 4: Simplify right side
    21,641.64x = 349,594,206.14
  5. Step 5: Solve for x
    x = 349,594,206.14/21,641.64
  6. Step 6: Final answer
    x = 16,153.78

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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.