Home / 21,121.86-31,702.69-13,240.16

Finding the Fourth Proportional to 21,121.86, 31,702.69 and 13,240.16

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Solution

The fourth proportional to 21,121.86, 31,702.69 and 13,240.16 is: 19,872.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.86 : 31,702.69 = 13,240.16 : x
  2. Step 2: Convert to fraction form
    21,121.86/31,702.69 = 13,240.16/x
  3. Step 3: Cross multiply
    21,121.86x = 31,702.69 × 13,240.16
  4. Step 4: Simplify right side
    21,121.86x = 419,748,664.95
  5. Step 5: Solve for x
    x = 419,748,664.95/21,121.86
  6. Step 6: Final answer
    x = 19,872.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.