Home / 686,528.20-1,029,986.70-213,261.40

Finding the Fourth Proportional to 686,528.20, 1,029,986.70 and 213,261.40

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Solution

The fourth proportional to 686,528.20, 1,029,986.70 and 213,261.40 is: 319,952.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,528.20 : 1,029,986.70 = 213,261.40 : x
  2. Step 2: Convert to fraction form
    686,528.20/1,029,986.70 = 213,261.40/x
  3. Step 3: Cross multiply
    686,528.20x = 1,029,986.70 × 213,261.40
  4. Step 4: Simplify right side
    686,528.20x = 219,656,405,623.38
  5. Step 5: Solve for x
    x = 219,656,405,623.38/686,528.20
  6. Step 6: Final answer
    x = 319,952.49

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Double scale
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Similar ratio
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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.