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Finding the Fourth Proportional to 1,392.29, 2,085.09 and 698.07

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Solution

The fourth proportional to 1,392.29, 2,085.09 and 698.07 is: 1,045.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.29 : 2,085.09 = 698.07 : x
  2. Step 2: Convert to fraction form
    1,392.29/2,085.09 = 698.07/x
  3. Step 3: Cross multiply
    1,392.29x = 2,085.09 × 698.07
  4. Step 4: Simplify right side
    1,392.29x = 1,455,536.18
  5. Step 5: Solve for x
    x = 1,455,536.18/1,392.29
  6. Step 6: Final answer
    x = 1,045.43

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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.