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Finding the Fourth Proportional to 309,009.09, 426,680.55 and 248,385.45

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Solution

The fourth proportional to 309,009.09, 426,680.55 and 248,385.45 is: 342,971.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,009.09 : 426,680.55 = 248,385.45 : x
  2. Step 2: Convert to fraction form
    309,009.09/426,680.55 = 248,385.45/x
  3. Step 3: Cross multiply
    309,009.09x = 426,680.55 × 248,385.45
  4. Step 4: Simplify right side
    309,009.09x = 105,981,240,418.00
  5. Step 5: Solve for x
    x = 105,981,240,418.00/309,009.09
  6. Step 6: Final answer
    x = 342,971.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.