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Finding the Fourth Proportional to 912.64, 1,368.80 and 327.51

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Solution

The fourth proportional to 912.64, 1,368.80 and 327.51 is: 491.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.64 : 1,368.80 = 327.51 : x
  2. Step 2: Convert to fraction form
    912.64/1,368.80 = 327.51/x
  3. Step 3: Cross multiply
    912.64x = 1,368.80 × 327.51
  4. Step 4: Simplify right side
    912.64x = 448,295.69
  5. Step 5: Solve for x
    x = 448,295.69/912.64
  6. Step 6: Final answer
    x = 491.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.