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Finding the Fourth Proportional to 686.57, 947.49 and 417.39

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Solution

The fourth proportional to 686.57, 947.49 and 417.39 is: 576.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.57 : 947.49 = 417.39 : x
  2. Step 2: Convert to fraction form
    686.57/947.49 = 417.39/x
  3. Step 3: Cross multiply
    686.57x = 947.49 × 417.39
  4. Step 4: Simplify right side
    686.57x = 395,466.03
  5. Step 5: Solve for x
    x = 395,466.03/686.57
  6. Step 6: Final answer
    x = 576.01

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Double scale
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1.5x scale

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.