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Finding the Fourth Proportional to 1,396.68, 1,927.90 and 807.46

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Solution

The fourth proportional to 1,396.68, 1,927.90 and 807.46 is: 1,114.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.68 : 1,927.90 = 807.46 : x
  2. Step 2: Convert to fraction form
    1,396.68/1,927.90 = 807.46/x
  3. Step 3: Cross multiply
    1,396.68x = 1,927.90 × 807.46
  4. Step 4: Simplify right side
    1,396.68x = 1,556,702.13
  5. Step 5: Solve for x
    x = 1,556,702.13/1,396.68
  6. Step 6: Final answer
    x = 1,114.57

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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.