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Finding the Fourth Proportional to 1,395.40, 1,925.90 and 805.92

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Solution

The fourth proportional to 1,395.40, 1,925.90 and 805.92 is: 1,112.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.40 : 1,925.90 = 805.92 : x
  2. Step 2: Convert to fraction form
    1,395.40/1,925.90 = 805.92/x
  3. Step 3: Cross multiply
    1,395.40x = 1,925.90 × 805.92
  4. Step 4: Simplify right side
    1,395.40x = 1,552,121.33
  5. Step 5: Solve for x
    x = 1,552,121.33/1,395.40
  6. Step 6: Final answer
    x = 1,112.31

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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.