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Finding the Fourth Proportional to 1,199.19, 1,653.65 and 820.68

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Solution

The fourth proportional to 1,199.19, 1,653.65 and 820.68 is: 1,131.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,199.19 : 1,653.65 = 820.68 : x
  2. Step 2: Convert to fraction form
    1,199.19/1,653.65 = 820.68/x
  3. Step 3: Cross multiply
    1,199.19x = 1,653.65 × 820.68
  4. Step 4: Simplify right side
    1,199.19x = 1,357,110.25
  5. Step 5: Solve for x
    x = 1,357,110.25/1,199.19
  6. Step 6: Final answer
    x = 1,131.69

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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.