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Finding the Fourth Proportional to 1,420.10, 1,960.11 and 1,272.48

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Solution

The fourth proportional to 1,420.10, 1,960.11 and 1,272.48 is: 1,756.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.10 : 1,960.11 = 1,272.48 : x
  2. Step 2: Convert to fraction form
    1,420.10/1,960.11 = 1,272.48/x
  3. Step 3: Cross multiply
    1,420.10x = 1,960.11 × 1,272.48
  4. Step 4: Simplify right side
    1,420.10x = 2,494,194.41
  5. Step 5: Solve for x
    x = 2,494,194.41/1,420.10
  6. Step 6: Final answer
    x = 1,756.35

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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.