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Finding the Fourth Proportional to 72,939.60, 109,409.40 and 72,939.60

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Solution

The fourth proportional to 72,939.60, 109,409.40 and 72,939.60 is: 109,409.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,939.60 : 109,409.40 = 72,939.60 : x
  2. Step 2: Convert to fraction form
    72,939.60/109,409.40 = 72,939.60/x
  3. Step 3: Cross multiply
    72,939.60x = 109,409.40 × 72,939.60
  4. Step 4: Simplify right side
    72,939.60x = 7,980,277,872.24
  5. Step 5: Solve for x
    x = 7,980,277,872.24/72,939.60
  6. Step 6: Final answer
    x = 109,409.40

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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.