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Finding the Fourth Proportional to 1,420.54, 1,960.71 and 1,272.92

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Solution

The fourth proportional to 1,420.54, 1,960.71 and 1,272.92 is: 1,756.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.54 : 1,960.71 = 1,272.92 : x
  2. Step 2: Convert to fraction form
    1,420.54/1,960.71 = 1,272.92/x
  3. Step 3: Cross multiply
    1,420.54x = 1,960.71 × 1,272.92
  4. Step 4: Simplify right side
    1,420.54x = 2,495,812.40
  5. Step 5: Solve for x
    x = 2,495,812.40/1,420.54
  6. Step 6: Final answer
    x = 1,756.95

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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.