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Finding the Fourth Proportional to 1,395.64, 1,926.20 and 806.36

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Solution

The fourth proportional to 1,395.64, 1,926.20 and 806.36 is: 1,112.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.64 : 1,926.20 = 806.36 : x
  2. Step 2: Convert to fraction form
    1,395.64/1,926.20 = 806.36/x
  3. Step 3: Cross multiply
    1,395.64x = 1,926.20 × 806.36
  4. Step 4: Simplify right side
    1,395.64x = 1,553,210.63
  5. Step 5: Solve for x
    x = 1,553,210.63/1,395.64
  6. Step 6: Final answer
    x = 1,112.90

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1.5x scale

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.