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Finding the Fourth Proportional to 1,312.88, 1,811.97 and 999.81

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Solution

The fourth proportional to 1,312.88, 1,811.97 and 999.81 is: 1,379.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.88 : 1,811.97 = 999.81 : x
  2. Step 2: Convert to fraction form
    1,312.88/1,811.97 = 999.81/x
  3. Step 3: Cross multiply
    1,312.88x = 1,811.97 × 999.81
  4. Step 4: Simplify right side
    1,312.88x = 1,811,625.73
  5. Step 5: Solve for x
    x = 1,811,625.73/1,312.88
  6. Step 6: Final answer
    x = 1,379.89

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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.