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Finding the Fourth Proportional to 72,440.80, 108,628.80 and 28,052.80

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Solution

The fourth proportional to 72,440.80, 108,628.80 and 28,052.80 is: 42,066.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,440.80 : 108,628.80 = 28,052.80 : x
  2. Step 2: Convert to fraction form
    72,440.80/108,628.80 = 28,052.80/x
  3. Step 3: Cross multiply
    72,440.80x = 108,628.80 × 28,052.80
  4. Step 4: Simplify right side
    72,440.80x = 3,047,342,000.64
  5. Step 5: Solve for x
    x = 3,047,342,000.64/72,440.80
  6. Step 6: Final answer
    x = 42,066.65

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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.