Home / 18,721.50-25,814.61-15,307.86

Finding the Fourth Proportional to 18,721.50, 25,814.61 and 15,307.86

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Solution

The fourth proportional to 18,721.50, 25,814.61 and 15,307.86 is: 21,107.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721.50 : 25,814.61 = 15,307.86 : x
  2. Step 2: Convert to fraction form
    18,721.50/25,814.61 = 15,307.86/x
  3. Step 3: Cross multiply
    18,721.50x = 25,814.61 × 15,307.86
  4. Step 4: Simplify right side
    18,721.50x = 395,166,435.83
  5. Step 5: Solve for x
    x = 395,166,435.83/18,721.50
  6. Step 6: Final answer
    x = 21,107.63

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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.