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Finding the Fourth Proportional to 935.73, 1,291.23 and 640.47

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Solution

The fourth proportional to 935.73, 1,291.23 and 640.47 is: 883.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.73 : 1,291.23 = 640.47 : x
  2. Step 2: Convert to fraction form
    935.73/1,291.23 = 640.47/x
  3. Step 3: Cross multiply
    935.73x = 1,291.23 × 640.47
  4. Step 4: Simplify right side
    935.73x = 826,994.08
  5. Step 5: Solve for x
    x = 826,994.08/935.73
  6. Step 6: Final answer
    x = 883.80

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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.