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Finding the Fourth Proportional to 686.92, 947.01 and 434.72

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Solution

The fourth proportional to 686.92, 947.01 and 434.72 is: 599.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.92 : 947.01 = 434.72 : x
  2. Step 2: Convert to fraction form
    686.92/947.01 = 434.72/x
  3. Step 3: Cross multiply
    686.92x = 947.01 × 434.72
  4. Step 4: Simplify right side
    686.92x = 411,684.85
  5. Step 5: Solve for x
    x = 411,684.85/686.92
  6. Step 6: Final answer
    x = 599.32

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Double scale
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Similar ratio
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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.