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Finding the Fourth Proportional to 1,313.85, 1,812.87 and 841.83

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Solution

The fourth proportional to 1,313.85, 1,812.87 and 841.83 is: 1,161.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.85 : 1,812.87 = 841.83 : x
  2. Step 2: Convert to fraction form
    1,313.85/1,812.87 = 841.83/x
  3. Step 3: Cross multiply
    1,313.85x = 1,812.87 × 841.83
  4. Step 4: Simplify right side
    1,313.85x = 1,526,128.35
  5. Step 5: Solve for x
    x = 1,526,128.35/1,313.85
  6. Step 6: Final answer
    x = 1,161.57

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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.