Home / 15,785.69-21,784.38-8,615.66

Finding the Fourth Proportional to 15,785.69, 21,784.38 and 8,615.66

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Solution

The fourth proportional to 15,785.69, 21,784.38 and 8,615.66 is: 11,889.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,785.69 : 21,784.38 = 8,615.66 : x
  2. Step 2: Convert to fraction form
    15,785.69/21,784.38 = 8,615.66/x
  3. Step 3: Cross multiply
    15,785.69x = 21,784.38 × 8,615.66
  4. Step 4: Simplify right side
    15,785.69x = 187,686,811.39
  5. Step 5: Solve for x
    x = 187,686,811.39/15,785.69
  6. Step 6: Final answer
    x = 11,889.68

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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.