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Finding the Fourth Proportional to 172,812.40, 259,218.60 and 72,939.40

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Solution

The fourth proportional to 172,812.40, 259,218.60 and 72,939.40 is: 109,409.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,812.40 : 259,218.60 = 72,939.40 : x
  2. Step 2: Convert to fraction form
    172,812.40/259,218.60 = 72,939.40/x
  3. Step 3: Cross multiply
    172,812.40x = 259,218.60 × 72,939.40
  4. Step 4: Simplify right side
    172,812.40x = 18,907,249,152.84
  5. Step 5: Solve for x
    x = 18,907,249,152.84/172,812.40
  6. Step 6: Final answer
    x = 109,409.10

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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.