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Finding the Fourth Proportional to 686.64, 947.56 and 376.14

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Solution

The fourth proportional to 686.64, 947.56 and 376.14 is: 519.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.64 : 947.56 = 376.14 : x
  2. Step 2: Convert to fraction form
    686.64/947.56 = 376.14/x
  3. Step 3: Cross multiply
    686.64x = 947.56 × 376.14
  4. Step 4: Simplify right side
    686.64x = 356,415.22
  5. Step 5: Solve for x
    x = 356,415.22/686.64
  6. Step 6: Final answer
    x = 519.07

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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.