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Finding the Fourth Proportional to 1,313.85, 1,969.10 and 697.85

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Solution

The fourth proportional to 1,313.85, 1,969.10 and 697.85 is: 1,045.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.85 : 1,969.10 = 697.85 : x
  2. Step 2: Convert to fraction form
    1,313.85/1,969.10 = 697.85/x
  3. Step 3: Cross multiply
    1,313.85x = 1,969.10 × 697.85
  4. Step 4: Simplify right side
    1,313.85x = 1,374,136.44
  5. Step 5: Solve for x
    x = 1,374,136.44/1,313.85
  6. Step 6: Final answer
    x = 1,045.89

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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.