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Finding the Fourth Proportional to 398,783.19, 550,009.65 and 255,556.56

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Solution

The fourth proportional to 398,783.19, 550,009.65 and 255,556.56 is: 352,468.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,783.19 : 550,009.65 = 255,556.56 : x
  2. Step 2: Convert to fraction form
    398,783.19/550,009.65 = 255,556.56/x
  3. Step 3: Cross multiply
    398,783.19x = 550,009.65 × 255,556.56
  4. Step 4: Simplify right side
    398,783.19x = 140,558,574,120.80
  5. Step 5: Solve for x
    x = 140,558,574,120.80/398,783.19
  6. Step 6: Final answer
    x = 352,468.65

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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.