Home / 15,709.32-21,678.89-8,635.79

Finding the Fourth Proportional to 15,709.32, 21,678.89 and 8,635.79

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Solution

The fourth proportional to 15,709.32, 21,678.89 and 8,635.79 is: 11,917.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,709.32 : 21,678.89 = 8,635.79 : x
  2. Step 2: Convert to fraction form
    15,709.32/21,678.89 = 8,635.79/x
  3. Step 3: Cross multiply
    15,709.32x = 21,678.89 × 8,635.79
  4. Step 4: Simplify right side
    15,709.32x = 187,214,189.90
  5. Step 5: Solve for x
    x = 187,214,189.90/15,709.32
  6. Step 6: Final answer
    x = 11,917.40

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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.