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Finding the Fourth Proportional to 15,787.99, 21,791.09 and 10,411.40

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Solution

The fourth proportional to 15,787.99, 21,791.09 and 10,411.40 is: 14,370.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,787.99 : 21,791.09 = 10,411.40 : x
  2. Step 2: Convert to fraction form
    15,787.99/21,791.09 = 10,411.40/x
  3. Step 3: Cross multiply
    15,787.99x = 21,791.09 × 10,411.40
  4. Step 4: Simplify right side
    15,787.99x = 226,875,623.15
  5. Step 5: Solve for x
    x = 226,875,623.15/15,787.99
  6. Step 6: Final answer
    x = 14,370.14

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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.