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Finding the Fourth Proportional to 947.64, 1,308.10 and 922.80

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Solution

The fourth proportional to 947.64, 1,308.10 and 922.80 is: 1,273.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.64 : 1,308.10 = 922.80 : x
  2. Step 2: Convert to fraction form
    947.64/1,308.10 = 922.80/x
  3. Step 3: Cross multiply
    947.64x = 1,308.10 × 922.80
  4. Step 4: Simplify right side
    947.64x = 1,207,114.68
  5. Step 5: Solve for x
    x = 1,207,114.68/947.64
  6. Step 6: Final answer
    x = 1,273.81

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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.