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Finding the Fourth Proportional to 21,787.94, 30,068.01 and 15,425.88

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Solution

The fourth proportional to 21,787.94, 30,068.01 and 15,425.88 is: 21,288.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,787.94 : 30,068.01 = 15,425.88 : x
  2. Step 2: Convert to fraction form
    21,787.94/30,068.01 = 15,425.88/x
  3. Step 3: Cross multiply
    21,787.94x = 30,068.01 × 15,425.88
  4. Step 4: Simplify right side
    21,787.94x = 463,825,514.10
  5. Step 5: Solve for x
    x = 463,825,514.10/21,787.94
  6. Step 6: Final answer
    x = 21,288.18

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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.