Home / 21,640.86-29,852.31-13,680.06

Finding the Fourth Proportional to 21,640.86, 29,852.31 and 13,680.06

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Solution

The fourth proportional to 21,640.86, 29,852.31 and 13,680.06 is: 18,870.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,640.86 : 29,852.31 = 13,680.06 : x
  2. Step 2: Convert to fraction form
    21,640.86/29,852.31 = 13,680.06/x
  3. Step 3: Cross multiply
    21,640.86x = 29,852.31 × 13,680.06
  4. Step 4: Simplify right side
    21,640.86x = 408,381,391.94
  5. Step 5: Solve for x
    x = 408,381,391.94/21,640.86
  6. Step 6: Final answer
    x = 18,870.85

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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.