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Finding the Fourth Proportional to 934.84, 1,290.39 and 640.96

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Solution

The fourth proportional to 934.84, 1,290.39 and 640.96 is: 884.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.84 : 1,290.39 = 640.96 : x
  2. Step 2: Convert to fraction form
    934.84/1,290.39 = 640.96/x
  3. Step 3: Cross multiply
    934.84x = 1,290.39 × 640.96
  4. Step 4: Simplify right side
    934.84x = 827,088.37
  5. Step 5: Solve for x
    x = 827,088.37/934.84
  6. Step 6: Final answer
    x = 884.74

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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.