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Finding the Fourth Proportional to 935.16, 1,290.78 and 641.16

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Solution

The fourth proportional to 935.16, 1,290.78 and 641.16 is: 884.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.16 : 1,290.78 = 641.16 : x
  2. Step 2: Convert to fraction form
    935.16/1,290.78 = 641.16/x
  3. Step 3: Cross multiply
    935.16x = 1,290.78 × 641.16
  4. Step 4: Simplify right side
    935.16x = 827,596.50
  5. Step 5: Solve for x
    x = 827,596.50/935.16
  6. Step 6: Final answer
    x = 884.98

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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.