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Finding the Fourth Proportional to 993.24, 1,369.71 and 661.68

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Solution

The fourth proportional to 993.24, 1,369.71 and 661.68 is: 912.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.24 : 1,369.71 = 661.68 : x
  2. Step 2: Convert to fraction form
    993.24/1,369.71 = 661.68/x
  3. Step 3: Cross multiply
    993.24x = 1,369.71 × 661.68
  4. Step 4: Simplify right side
    993.24x = 906,309.71
  5. Step 5: Solve for x
    x = 906,309.71/993.24
  6. Step 6: Final answer
    x = 912.48

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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.