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Finding the Fourth Proportional to 945.26, 1,303.94 and 665.38

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Solution

The fourth proportional to 945.26, 1,303.94 and 665.38 is: 917.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.26 : 1,303.94 = 665.38 : x
  2. Step 2: Convert to fraction form
    945.26/1,303.94 = 665.38/x
  3. Step 3: Cross multiply
    945.26x = 1,303.94 × 665.38
  4. Step 4: Simplify right side
    945.26x = 867,615.60
  5. Step 5: Solve for x
    x = 867,615.60/945.26
  6. Step 6: Final answer
    x = 917.86

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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.