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Finding the Fourth Proportional to 911.90, 1,367.58 and 738.20

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Solution

The fourth proportional to 911.90, 1,367.58 and 738.20 is: 1,107.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.90 : 1,367.58 = 738.20 : x
  2. Step 2: Convert to fraction form
    911.90/1,367.58 = 738.20/x
  3. Step 3: Cross multiply
    911.90x = 1,367.58 × 738.20
  4. Step 4: Simplify right side
    911.90x = 1,009,547.56
  5. Step 5: Solve for x
    x = 1,009,547.56/911.90
  6. Step 6: Final answer
    x = 1,107.08

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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.