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Finding the Fourth Proportional to 21,339, 29,449.44 and 12,957.12

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Solution

The fourth proportional to 21,339, 29,449.44 and 12,957.12 is: 17,881.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,339 : 29,449.44 = 12,957.12 : x
  2. Step 2: Convert to fraction form
    21,339/29,449.44 = 12,957.12/x
  3. Step 3: Cross multiply
    21,339x = 29,449.44 × 12,957.12
  4. Step 4: Simplify right side
    21,339x = 381,579,928.01
  5. Step 5: Solve for x
    x = 381,579,928.01/21,339
  6. Step 6: Final answer
    x = 17,881.81

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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.