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Finding the Fourth Proportional to 1,353.11, 1,866.65 and 855.36

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Solution

The fourth proportional to 1,353.11, 1,866.65 and 855.36 is: 1,179.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,353.11 : 1,866.65 = 855.36 : x
  2. Step 2: Convert to fraction form
    1,353.11/1,866.65 = 855.36/x
  3. Step 3: Cross multiply
    1,353.11x = 1,866.65 × 855.36
  4. Step 4: Simplify right side
    1,353.11x = 1,596,653.47
  5. Step 5: Solve for x
    x = 1,596,653.47/1,353.11
  6. Step 6: Final answer
    x = 1,179.99

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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.