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Finding the Fourth Proportional to 842.12, 1,261.74 and 711.98

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Solution

The fourth proportional to 842.12, 1,261.74 and 711.98 is: 1,066.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.12 : 1,261.74 = 711.98 : x
  2. Step 2: Convert to fraction form
    842.12/1,261.74 = 711.98/x
  3. Step 3: Cross multiply
    842.12x = 1,261.74 × 711.98
  4. Step 4: Simplify right side
    842.12x = 898,333.65
  5. Step 5: Solve for x
    x = 898,333.65/842.12
  6. Step 6: Final answer
    x = 1,066.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.