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Finding the Fourth Proportional to 1,396.79, 1,927.91 and 807.66

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Solution

The fourth proportional to 1,396.79, 1,927.91 and 807.66 is: 1,114.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.79 : 1,927.91 = 807.66 : x
  2. Step 2: Convert to fraction form
    1,396.79/1,927.91 = 807.66/x
  3. Step 3: Cross multiply
    1,396.79x = 1,927.91 × 807.66
  4. Step 4: Simplify right side
    1,396.79x = 1,557,095.79
  5. Step 5: Solve for x
    x = 1,557,095.79/1,396.79
  6. Step 6: Final answer
    x = 1,114.77

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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.