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Finding the Fourth Proportional to 310,540.20, 428,870.79 and 213,995.09

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Solution

The fourth proportional to 310,540.20, 428,870.79 and 213,995.09 is: 295,537.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,540.20 : 428,870.79 = 213,995.09 : x
  2. Step 2: Convert to fraction form
    310,540.20/428,870.79 = 213,995.09/x
  3. Step 3: Cross multiply
    310,540.20x = 428,870.79 × 213,995.09
  4. Step 4: Simplify right side
    310,540.20x = 91,776,243,304.42
  5. Step 5: Solve for x
    x = 91,776,243,304.42/310,540.20
  6. Step 6: Final answer
    x = 295,537.40

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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.