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Finding the Fourth Proportional to 935.60, 1,290.36 and 823.32

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Solution

The fourth proportional to 935.60, 1,290.36 and 823.32 is: 1,135.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.60 : 1,290.36 = 823.32 : x
  2. Step 2: Convert to fraction form
    935.60/1,290.36 = 823.32/x
  3. Step 3: Cross multiply
    935.60x = 1,290.36 × 823.32
  4. Step 4: Simplify right side
    935.60x = 1,062,379.20
  5. Step 5: Solve for x
    x = 1,062,379.20/935.60
  6. Step 6: Final answer
    x = 1,135.51

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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.