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Finding the Fourth Proportional to 72,431.80, 108,647.70 and 48,812.20

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Solution

The fourth proportional to 72,431.80, 108,647.70 and 48,812.20 is: 73,218.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,431.80 : 108,647.70 = 48,812.20 : x
  2. Step 2: Convert to fraction form
    72,431.80/108,647.70 = 48,812.20/x
  3. Step 3: Cross multiply
    72,431.80x = 108,647.70 × 48,812.20
  4. Step 4: Simplify right side
    72,431.80x = 5,303,333,261.94
  5. Step 5: Solve for x
    x = 5,303,333,261.94/72,431.80
  6. Step 6: Final answer
    x = 73,218.30

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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.