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Finding the Fourth Proportional to 686.11, 947.07 and 406.58

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Solution

The fourth proportional to 686.11, 947.07 and 406.58 is: 561.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.11 : 947.07 = 406.58 : x
  2. Step 2: Convert to fraction form
    686.11/947.07 = 406.58/x
  3. Step 3: Cross multiply
    686.11x = 947.07 × 406.58
  4. Step 4: Simplify right side
    686.11x = 385,059.72
  5. Step 5: Solve for x
    x = 385,059.72/686.11
  6. Step 6: Final answer
    x = 561.22

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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.