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Finding the Fourth Proportional to 681.16, 939.85 and 386.32

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Solution

The fourth proportional to 681.16, 939.85 and 386.32 is: 533.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.16 : 939.85 = 386.32 : x
  2. Step 2: Convert to fraction form
    681.16/939.85 = 386.32/x
  3. Step 3: Cross multiply
    681.16x = 939.85 × 386.32
  4. Step 4: Simplify right side
    681.16x = 363,082.85
  5. Step 5: Solve for x
    x = 363,082.85/681.16
  6. Step 6: Final answer
    x = 533.04

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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.