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Finding the Fourth Proportional to 685.97, 946.65 and 383.15

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Solution

The fourth proportional to 685.97, 946.65 and 383.15 is: 528.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.97 : 946.65 = 383.15 : x
  2. Step 2: Convert to fraction form
    685.97/946.65 = 383.15/x
  3. Step 3: Cross multiply
    685.97x = 946.65 × 383.15
  4. Step 4: Simplify right side
    685.97x = 362,708.95
  5. Step 5: Solve for x
    x = 362,708.95/685.97
  6. Step 6: Final answer
    x = 528.75

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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.