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Finding the Fourth Proportional to 505.67, 697.41 and 387.68

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Solution

The fourth proportional to 505.67, 697.41 and 387.68 is: 534.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.67 : 697.41 = 387.68 : x
  2. Step 2: Convert to fraction form
    505.67/697.41 = 387.68/x
  3. Step 3: Cross multiply
    505.67x = 697.41 × 387.68
  4. Step 4: Simplify right side
    505.67x = 270,368.42
  5. Step 5: Solve for x
    x = 270,368.42/505.67
  6. Step 6: Final answer
    x = 534.68

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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.