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Finding the Fourth Proportional to 1,342.78, 2,014.18 and 418.40

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Solution

The fourth proportional to 1,342.78, 2,014.18 and 418.40 is: 627.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,342.78 : 2,014.18 = 418.40 : x
  2. Step 2: Convert to fraction form
    1,342.78/2,014.18 = 418.40/x
  3. Step 3: Cross multiply
    1,342.78x = 2,014.18 × 418.40
  4. Step 4: Simplify right side
    1,342.78x = 842,729.35
  5. Step 5: Solve for x
    x = 842,729.35/1,342.78
  6. Step 6: Final answer
    x = 627.60

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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.