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Finding the Fourth Proportional to 912.19, 1,258.81 and 519.22

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Solution

The fourth proportional to 912.19, 1,258.81 and 519.22 is: 716.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.19 : 1,258.81 = 519.22 : x
  2. Step 2: Convert to fraction form
    912.19/1,258.81 = 519.22/x
  3. Step 3: Cross multiply
    912.19x = 1,258.81 × 519.22
  4. Step 4: Simplify right side
    912.19x = 653,599.33
  5. Step 5: Solve for x
    x = 653,599.33/912.19
  6. Step 6: Final answer
    x = 716.52

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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.