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Finding the Fourth Proportional to 21,335.28, 29,443.20 and 11,905.20

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Solution

The fourth proportional to 21,335.28, 29,443.20 and 11,905.20 is: 16,429.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,335.28 : 29,443.20 = 11,905.20 : x
  2. Step 2: Convert to fraction form
    21,335.28/29,443.20 = 11,905.20/x
  3. Step 3: Cross multiply
    21,335.28x = 29,443.20 × 11,905.20
  4. Step 4: Simplify right side
    21,335.28x = 350,527,184.64
  5. Step 5: Solve for x
    x = 350,527,184.64/21,335.28
  6. Step 6: Final answer
    x = 16,429.46

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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.