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Finding the Fourth Proportional to 686.63, 947.79 and 410.63

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Solution

The fourth proportional to 686.63, 947.79 and 410.63 is: 566.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.63 : 947.79 = 410.63 : x
  2. Step 2: Convert to fraction form
    686.63/947.79 = 410.63/x
  3. Step 3: Cross multiply
    686.63x = 947.79 × 410.63
  4. Step 4: Simplify right side
    686.63x = 389,184.22
  5. Step 5: Solve for x
    x = 389,184.22/686.63
  6. Step 6: Final answer
    x = 566.81

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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.