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Finding the Fourth Proportional to 912.19, 1,258.87 and 513.88

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Solution

The fourth proportional to 912.19, 1,258.87 and 513.88 is: 709.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.19 : 1,258.87 = 513.88 : x
  2. Step 2: Convert to fraction form
    912.19/1,258.87 = 513.88/x
  3. Step 3: Cross multiply
    912.19x = 1,258.87 × 513.88
  4. Step 4: Simplify right side
    912.19x = 646,908.12
  5. Step 5: Solve for x
    x = 646,908.12/912.19
  6. Step 6: Final answer
    x = 709.18

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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.