Home / 21,196.86-31,805.61-8,720.65

Finding the Fourth Proportional to 21,196.86, 31,805.61 and 8,720.65

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Solution

The fourth proportional to 21,196.86, 31,805.61 and 8,720.65 is: 13,085.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,196.86 : 31,805.61 = 8,720.65 : x
  2. Step 2: Convert to fraction form
    21,196.86/31,805.61 = 8,720.65/x
  3. Step 3: Cross multiply
    21,196.86x = 31,805.61 × 8,720.65
  4. Step 4: Simplify right side
    21,196.86x = 277,365,592.85
  5. Step 5: Solve for x
    x = 277,365,592.85/21,196.86
  6. Step 6: Final answer
    x = 13,085.22

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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.