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Finding the Fourth Proportional to 1,271.61, 1,754.60 and 711.99

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Solution

The fourth proportional to 1,271.61, 1,754.60 and 711.99 is: 982.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.61 : 1,754.60 = 711.99 : x
  2. Step 2: Convert to fraction form
    1,271.61/1,754.60 = 711.99/x
  3. Step 3: Cross multiply
    1,271.61x = 1,754.60 × 711.99
  4. Step 4: Simplify right side
    1,271.61x = 1,249,254.09
  5. Step 5: Solve for x
    x = 1,249,254.09/1,271.61
  6. Step 6: Final answer
    x = 982.42

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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.