Home / 15,739.72-21,720.02-8,665.99

Finding the Fourth Proportional to 15,739.72, 21,720.02 and 8,665.99

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Solution

The fourth proportional to 15,739.72, 21,720.02 and 8,665.99 is: 11,958.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,739.72 : 21,720.02 = 8,665.99 : x
  2. Step 2: Convert to fraction form
    15,739.72/21,720.02 = 8,665.99/x
  3. Step 3: Cross multiply
    15,739.72x = 21,720.02 × 8,665.99
  4. Step 4: Simplify right side
    15,739.72x = 188,225,378.49
  5. Step 5: Solve for x
    x = 188,225,378.49/15,739.72
  6. Step 6: Final answer
    x = 11,958.62

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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.