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Finding the Fourth Proportional to 1,396.48, 1,927.10 and 807

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Solution

The fourth proportional to 1,396.48, 1,927.10 and 807 is: 1,113.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.48 : 1,927.10 = 807 : x
  2. Step 2: Convert to fraction form
    1,396.48/1,927.10 = 807/x
  3. Step 3: Cross multiply
    1,396.48x = 1,927.10 × 807
  4. Step 4: Simplify right side
    1,396.48x = 1,555,169.70
  5. Step 5: Solve for x
    x = 1,555,169.70/1,396.48
  6. Step 6: Final answer
    x = 1,113.64

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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.