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Finding the Fourth Proportional to 936, 1,291.68 and 660.48

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Solution

The fourth proportional to 936, 1,291.68 and 660.48 is: 911.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    936 : 1,291.68 = 660.48 : x
  2. Step 2: Convert to fraction form
    936/1,291.68 = 660.48/x
  3. Step 3: Cross multiply
    936x = 1,291.68 × 660.48
  4. Step 4: Simplify right side
    936x = 853,128.81
  5. Step 5: Solve for x
    x = 853,128.81/936
  6. Step 6: Final answer
    x = 911.46

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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.