Home / 21,288.30-29,381.31-12,908.94

Finding the Fourth Proportional to 21,288.30, 29,381.31 and 12,908.94

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Solution

The fourth proportional to 21,288.30, 29,381.31 and 12,908.94 is: 17,816.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,288.30 : 29,381.31 = 12,908.94 : x
  2. Step 2: Convert to fraction form
    21,288.30/29,381.31 = 12,908.94/x
  3. Step 3: Cross multiply
    21,288.30x = 29,381.31 × 12,908.94
  4. Step 4: Simplify right side
    21,288.30x = 379,281,567.91
  5. Step 5: Solve for x
    x = 379,281,567.91/21,288.30
  6. Step 6: Final answer
    x = 17,816.43

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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.