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Finding the Fourth Proportional to 72,719.04, 109,078.56 and 20,128.56

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Solution

The fourth proportional to 72,719.04, 109,078.56 and 20,128.56 is: 30,192.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,719.04 : 109,078.56 = 20,128.56 : x
  2. Step 2: Convert to fraction form
    72,719.04/109,078.56 = 20,128.56/x
  3. Step 3: Cross multiply
    72,719.04x = 109,078.56 × 20,128.56
  4. Step 4: Simplify right side
    72,719.04x = 2,195,594,339.67
  5. Step 5: Solve for x
    x = 2,195,594,339.67/72,719.04
  6. Step 6: Final answer
    x = 30,192.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.