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Finding the Fourth Proportional to 21,672.64, 32,560.80 and 13,896.64

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Solution

The fourth proportional to 21,672.64, 32,560.80 and 13,896.64 is: 20,878.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,672.64 : 32,560.80 = 13,896.64 : x
  2. Step 2: Convert to fraction form
    21,672.64/32,560.80 = 13,896.64/x
  3. Step 3: Cross multiply
    21,672.64x = 32,560.80 × 13,896.64
  4. Step 4: Simplify right side
    21,672.64x = 452,485,715.71
  5. Step 5: Solve for x
    x = 452,485,715.71/21,672.64
  6. Step 6: Final answer
    x = 20,878.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.