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Finding the Fourth Proportional to 947.79, 1,308.05 and 682.16

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Solution

The fourth proportional to 947.79, 1,308.05 and 682.16 is: 941.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.79 : 1,308.05 = 682.16 : x
  2. Step 2: Convert to fraction form
    947.79/1,308.05 = 682.16/x
  3. Step 3: Cross multiply
    947.79x = 1,308.05 × 682.16
  4. Step 4: Simplify right side
    947.79x = 892,289.44
  5. Step 5: Solve for x
    x = 892,289.44/947.79
  6. Step 6: Final answer
    x = 941.44

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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.