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Finding the Fourth Proportional to 1,271.60, 1,754.87 and 712.07

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Solution

The fourth proportional to 1,271.60, 1,754.87 and 712.07 is: 982.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.60 : 1,754.87 = 712.07 : x
  2. Step 2: Convert to fraction form
    1,271.60/1,754.87 = 712.07/x
  3. Step 3: Cross multiply
    1,271.60x = 1,754.87 × 712.07
  4. Step 4: Simplify right side
    1,271.60x = 1,249,577.95
  5. Step 5: Solve for x
    x = 1,249,577.95/1,271.60
  6. Step 6: Final answer
    x = 982.69

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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.