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Finding the Fourth Proportional to 1,271.76, 1,755.07 and 712.20

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Solution

The fourth proportional to 1,271.76, 1,755.07 and 712.20 is: 982.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.76 : 1,755.07 = 712.20 : x
  2. Step 2: Convert to fraction form
    1,271.76/1,755.07 = 712.20/x
  3. Step 3: Cross multiply
    1,271.76x = 1,755.07 × 712.20
  4. Step 4: Simplify right side
    1,271.76x = 1,249,957.02
  5. Step 5: Solve for x
    x = 1,249,957.02/1,271.76
  6. Step 6: Final answer
    x = 982.85

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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.