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Finding the Fourth Proportional to 1,271.90, 1,755.17 and 712.36

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Solution

The fourth proportional to 1,271.90, 1,755.17 and 712.36 is: 983.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.90 : 1,755.17 = 712.36 : x
  2. Step 2: Convert to fraction form
    1,271.90/1,755.17 = 712.36/x
  3. Step 3: Cross multiply
    1,271.90x = 1,755.17 × 712.36
  4. Step 4: Simplify right side
    1,271.90x = 1,250,312.90
  5. Step 5: Solve for x
    x = 1,250,312.90/1,271.90
  6. Step 6: Final answer
    x = 983.03

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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.