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Finding the Fourth Proportional to 681.85, 940.86 and 387.05

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Solution

The fourth proportional to 681.85, 940.86 and 387.05 is: 534.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.85 : 940.86 = 387.05 : x
  2. Step 2: Convert to fraction form
    681.85/940.86 = 387.05/x
  3. Step 3: Cross multiply
    681.85x = 940.86 × 387.05
  4. Step 4: Simplify right side
    681.85x = 364,159.86
  5. Step 5: Solve for x
    x = 364,159.86/681.85
  6. Step 6: Final answer
    x = 534.08

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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.