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Finding the Fourth Proportional to 1,271.23, 1,754.10 and 711.64

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Solution

The fourth proportional to 1,271.23, 1,754.10 and 711.64 is: 981.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.23 : 1,754.10 = 711.64 : x
  2. Step 2: Convert to fraction form
    1,271.23/1,754.10 = 711.64/x
  3. Step 3: Cross multiply
    1,271.23x = 1,754.10 × 711.64
  4. Step 4: Simplify right side
    1,271.23x = 1,248,287.72
  5. Step 5: Solve for x
    x = 1,248,287.72/1,271.23
  6. Step 6: Final answer
    x = 981.95

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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.