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Finding the Fourth Proportional to 1,809.38, 2,712.78 and 639.14

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Solution

The fourth proportional to 1,809.38, 2,712.78 and 639.14 is: 958.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,809.38 : 2,712.78 = 639.14 : x
  2. Step 2: Convert to fraction form
    1,809.38/2,712.78 = 639.14/x
  3. Step 3: Cross multiply
    1,809.38x = 2,712.78 × 639.14
  4. Step 4: Simplify right side
    1,809.38x = 1,733,846.21
  5. Step 5: Solve for x
    x = 1,733,846.21/1,809.38
  6. Step 6: Final answer
    x = 958.25

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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.