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Finding the Fourth Proportional to 1,267.67, 1,902.11 and 878.00

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Solution

The fourth proportional to 1,267.67, 1,902.11 and 878.00 is: 1,317.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,267.67 : 1,902.11 = 878.00 : x
  2. Step 2: Convert to fraction form
    1,267.67/1,902.11 = 878.00/x
  3. Step 3: Cross multiply
    1,267.67x = 1,902.11 × 878.00
  4. Step 4: Simplify right side
    1,267.67x = 1,670,038.68
  5. Step 5: Solve for x
    x = 1,670,038.68/1,267.67
  6. Step 6: Final answer
    x = 1,317.41

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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.