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Finding the Fourth Proportional to 687.14, 947.65 and 476.94

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Solution

The fourth proportional to 687.14, 947.65 and 476.94 is: 657.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.14 : 947.65 = 476.94 : x
  2. Step 2: Convert to fraction form
    687.14/947.65 = 476.94/x
  3. Step 3: Cross multiply
    687.14x = 947.65 × 476.94
  4. Step 4: Simplify right side
    687.14x = 451,972.19
  5. Step 5: Solve for x
    x = 451,972.19/687.14
  6. Step 6: Final answer
    x = 657.76

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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.