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Finding the Fourth Proportional to 1,392.66, 2,089.71 and 905.22

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Solution

The fourth proportional to 1,392.66, 2,089.71 and 905.22 is: 1,358.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.66 : 2,089.71 = 905.22 : x
  2. Step 2: Convert to fraction form
    1,392.66/2,089.71 = 905.22/x
  3. Step 3: Cross multiply
    1,392.66x = 2,089.71 × 905.22
  4. Step 4: Simplify right side
    1,392.66x = 1,891,647.29
  5. Step 5: Solve for x
    x = 1,891,647.29/1,392.66
  6. Step 6: Final answer
    x = 1,358.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.