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Finding the Fourth Proportional to 935.12, 1,290.56 and 641.36

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Solution

The fourth proportional to 935.12, 1,290.56 and 641.36 is: 885.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.12 : 1,290.56 = 641.36 : x
  2. Step 2: Convert to fraction form
    935.12/1,290.56 = 641.36/x
  3. Step 3: Cross multiply
    935.12x = 1,290.56 × 641.36
  4. Step 4: Simplify right side
    935.12x = 827,713.56
  5. Step 5: Solve for x
    x = 827,713.56/935.12
  6. Step 6: Final answer
    x = 885.14

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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.