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Finding the Fourth Proportional to 289,786.80, 434,809.80 and 139,969.20

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Solution

The fourth proportional to 289,786.80, 434,809.80 and 139,969.20 is: 210,016.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,786.80 : 434,809.80 = 139,969.20 : x
  2. Step 2: Convert to fraction form
    289,786.80/434,809.80 = 139,969.20/x
  3. Step 3: Cross multiply
    289,786.80x = 434,809.80 × 139,969.20
  4. Step 4: Simplify right side
    289,786.80x = 60,859,979,858.16
  5. Step 5: Solve for x
    x = 60,859,979,858.16/289,786.80
  6. Step 6: Final answer
    x = 210,016.40

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1.5x scale

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.