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Finding the Fourth Proportional to 934.96, 1,290.54 and 640.12

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Solution

The fourth proportional to 934.96, 1,290.54 and 640.12 is: 883.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.96 : 1,290.54 = 640.12 : x
  2. Step 2: Convert to fraction form
    934.96/1,290.54 = 640.12/x
  3. Step 3: Cross multiply
    934.96x = 1,290.54 × 640.12
  4. Step 4: Simplify right side
    934.96x = 826,100.46
  5. Step 5: Solve for x
    x = 826,100.46/934.96
  6. Step 6: Final answer
    x = 883.57

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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.