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Finding the Fourth Proportional to 240,939.80, 361,409.70 and 128,965.40

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Solution

The fourth proportional to 240,939.80, 361,409.70 and 128,965.40 is: 193,448.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    240,939.80 : 361,409.70 = 128,965.40 : x
  2. Step 2: Convert to fraction form
    240,939.80/361,409.70 = 128,965.40/x
  3. Step 3: Cross multiply
    240,939.80x = 361,409.70 × 128,965.40
  4. Step 4: Simplify right side
    240,939.80x = 46,609,346,524.38
  5. Step 5: Solve for x
    x = 46,609,346,524.38/240,939.80
  6. Step 6: Final answer
    x = 193,448.10

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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.