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Finding the Fourth Proportional to 686.71, 947.68 and 406.94

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Solution

The fourth proportional to 686.71, 947.68 and 406.94 is: 561.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.71 : 947.68 = 406.94 : x
  2. Step 2: Convert to fraction form
    686.71/947.68 = 406.94/x
  3. Step 3: Cross multiply
    686.71x = 947.68 × 406.94
  4. Step 4: Simplify right side
    686.71x = 385,646.86
  5. Step 5: Solve for x
    x = 385,646.86/686.71
  6. Step 6: Final answer
    x = 561.59

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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.