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Finding the Fourth Proportional to 1,416.09, 1,954.17 and 786.61

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Solution

The fourth proportional to 1,416.09, 1,954.17 and 786.61 is: 1,085.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,416.09 : 1,954.17 = 786.61 : x
  2. Step 2: Convert to fraction form
    1,416.09/1,954.17 = 786.61/x
  3. Step 3: Cross multiply
    1,416.09x = 1,954.17 × 786.61
  4. Step 4: Simplify right side
    1,416.09x = 1,537,169.66
  5. Step 5: Solve for x
    x = 1,537,169.66/1,416.09
  6. Step 6: Final answer
    x = 1,085.51

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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.