Home / 19,665.20-27,172.52-15,718.88

Finding the Fourth Proportional to 19,665.20, 27,172.52 and 15,718.88

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Solution

The fourth proportional to 19,665.20, 27,172.52 and 15,718.88 is: 21,719.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,665.20 : 27,172.52 = 15,718.88 : x
  2. Step 2: Convert to fraction form
    19,665.20/27,172.52 = 15,718.88/x
  3. Step 3: Cross multiply
    19,665.20x = 27,172.52 × 15,718.88
  4. Step 4: Simplify right side
    19,665.20x = 427,121,581.18
  5. Step 5: Solve for x
    x = 427,121,581.18/19,665.20
  6. Step 6: Final answer
    x = 21,719.67

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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.