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Finding the Fourth Proportional to 935.39, 1,288.54 and 787.97

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Solution

The fourth proportional to 935.39, 1,288.54 and 787.97 is: 1,085.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.39 : 1,288.54 = 787.97 : x
  2. Step 2: Convert to fraction form
    935.39/1,288.54 = 787.97/x
  3. Step 3: Cross multiply
    935.39x = 1,288.54 × 787.97
  4. Step 4: Simplify right side
    935.39x = 1,015,330.86
  5. Step 5: Solve for x
    x = 1,015,330.86/935.39
  6. Step 6: Final answer
    x = 1,085.46

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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.