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Finding the Fourth Proportional to 72,405.20, 108,607.80 and 19,812.80

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Solution

The fourth proportional to 72,405.20, 108,607.80 and 19,812.80 is: 29,719.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,405.20 : 108,607.80 = 19,812.80 : x
  2. Step 2: Convert to fraction form
    72,405.20/108,607.80 = 19,812.80/x
  3. Step 3: Cross multiply
    72,405.20x = 108,607.80 × 19,812.80
  4. Step 4: Simplify right side
    72,405.20x = 2,151,824,619.84
  5. Step 5: Solve for x
    x = 2,151,824,619.84/72,405.20
  6. Step 6: Final answer
    x = 29,719.20

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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.