Home / 820,670.40-1,231,120.80-259,646.40

Finding the Fourth Proportional to 820,670.40, 1,231,120.80 and 259,646.40

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Solution

The fourth proportional to 820,670.40, 1,231,120.80 and 259,646.40 is: 389,506.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,670.40 : 1,231,120.80 = 259,646.40 : x
  2. Step 2: Convert to fraction form
    820,670.40/1,231,120.80 = 259,646.40/x
  3. Step 3: Cross multiply
    820,670.40x = 1,231,120.80 × 259,646.40
  4. Step 4: Simplify right side
    820,670.40x = 319,656,083,685.12
  5. Step 5: Solve for x
    x = 319,656,083,685.12/820,670.40
  6. Step 6: Final answer
    x = 389,506.05

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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.