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Finding the Fourth Proportional to 48,440.80, 72,661.20 and 45,719.20

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Solution

The fourth proportional to 48,440.80, 72,661.20 and 45,719.20 is: 68,578.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    48,440.80 : 72,661.20 = 45,719.20 : x
  2. Step 2: Convert to fraction form
    48,440.80/72,661.20 = 45,719.20/x
  3. Step 3: Cross multiply
    48,440.80x = 72,661.20 × 45,719.20
  4. Step 4: Simplify right side
    48,440.80x = 3,322,011,935.04
  5. Step 5: Solve for x
    x = 3,322,011,935.04/48,440.80
  6. Step 6: Final answer
    x = 68,578.80

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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.