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Finding the Fourth Proportional to 1,219.34, 1,681.93 and 799.72

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Solution

The fourth proportional to 1,219.34, 1,681.93 and 799.72 is: 1,103.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.34 : 1,681.93 = 799.72 : x
  2. Step 2: Convert to fraction form
    1,219.34/1,681.93 = 799.72/x
  3. Step 3: Cross multiply
    1,219.34x = 1,681.93 × 799.72
  4. Step 4: Simplify right side
    1,219.34x = 1,345,069.85
  5. Step 5: Solve for x
    x = 1,345,069.85/1,219.34
  6. Step 6: Final answer
    x = 1,103.11

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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.