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Finding the Fourth Proportional to 1,311.98, 1,964.74 and 848.34

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Solution

The fourth proportional to 1,311.98, 1,964.74 and 848.34 is: 1,270.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.98 : 1,964.74 = 848.34 : x
  2. Step 2: Convert to fraction form
    1,311.98/1,964.74 = 848.34/x
  3. Step 3: Cross multiply
    1,311.98x = 1,964.74 × 848.34
  4. Step 4: Simplify right side
    1,311.98x = 1,666,767.00
  5. Step 5: Solve for x
    x = 1,666,767.00/1,311.98
  6. Step 6: Final answer
    x = 1,270.42

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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.