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Finding the Fourth Proportional to 1,148.41, 1,722.89 and 418.20

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Solution

The fourth proportional to 1,148.41, 1,722.89 and 418.20 is: 627.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,148.41 : 1,722.89 = 418.20 : x
  2. Step 2: Convert to fraction form
    1,148.41/1,722.89 = 418.20/x
  3. Step 3: Cross multiply
    1,148.41x = 1,722.89 × 418.20
  4. Step 4: Simplify right side
    1,148.41x = 720,512.60
  5. Step 5: Solve for x
    x = 720,512.60/1,148.41
  6. Step 6: Final answer
    x = 627.40

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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.