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Finding the Fourth Proportional to 1,449.15, 1,999.82 and 786

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Solution

The fourth proportional to 1,449.15, 1,999.82 and 786 is: 1,084.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,449.15 : 1,999.82 = 786 : x
  2. Step 2: Convert to fraction form
    1,449.15/1,999.82 = 786/x
  3. Step 3: Cross multiply
    1,449.15x = 1,999.82 × 786
  4. Step 4: Simplify right side
    1,449.15x = 1,571,854.59
  5. Step 5: Solve for x
    x = 1,571,854.59/1,449.15
  6. Step 6: Final answer
    x = 1,084.67

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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.