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Finding the Fourth Proportional to 912.05, 1,258.61 and 519.08

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Solution

The fourth proportional to 912.05, 1,258.61 and 519.08 is: 716.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.05 : 1,258.61 = 519.08 : x
  2. Step 2: Convert to fraction form
    912.05/1,258.61 = 519.08/x
  3. Step 3: Cross multiply
    912.05x = 1,258.61 × 519.08
  4. Step 4: Simplify right side
    912.05x = 653,314.28
  5. Step 5: Solve for x
    x = 653,314.28/912.05
  6. Step 6: Final answer
    x = 716.31

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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.