Home / 15,785.70-21,784.31-8,615.68

Finding the Fourth Proportional to 15,785.70, 21,784.31 and 8,615.68

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Solution

The fourth proportional to 15,785.70, 21,784.31 and 8,615.68 is: 11,889.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,785.70 : 21,784.31 = 8,615.68 : x
  2. Step 2: Convert to fraction form
    15,785.70/21,784.31 = 8,615.68/x
  3. Step 3: Cross multiply
    15,785.70x = 21,784.31 × 8,615.68
  4. Step 4: Simplify right side
    15,785.70x = 187,686,714.44
  5. Step 5: Solve for x
    x = 187,686,714.44/15,785.70
  6. Step 6: Final answer
    x = 11,889.67

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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.