Home / 839,644.80-1,259,107.32-390,318.78

Finding the Fourth Proportional to 839,644.80, 1,259,107.32 and 390,318.78

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Solution

The fourth proportional to 839,644.80, 1,259,107.32 and 390,318.78 is: 585,310.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    839,644.80 : 1,259,107.32 = 390,318.78 : x
  2. Step 2: Convert to fraction form
    839,644.80/1,259,107.32 = 390,318.78/x
  3. Step 3: Cross multiply
    839,644.80x = 1,259,107.32 × 390,318.78
  4. Step 4: Simplify right side
    839,644.80x = 491,453,233,031.47
  5. Step 5: Solve for x
    x = 491,453,233,031.47/839,644.80
  6. Step 6: Final answer
    x = 585,310.88

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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.