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Finding the Fourth Proportional to 912.15, 1,258.74 and 519.21

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Solution

The fourth proportional to 912.15, 1,258.74 and 519.21 is: 716.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.15 : 1,258.74 = 519.21 : x
  2. Step 2: Convert to fraction form
    912.15/1,258.74 = 519.21/x
  3. Step 3: Cross multiply
    912.15x = 1,258.74 × 519.21
  4. Step 4: Simplify right side
    912.15x = 653,550.40
  5. Step 5: Solve for x
    x = 653,550.40/912.15
  6. Step 6: Final answer
    x = 716.49

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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.