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Finding the Fourth Proportional to 1,416.31, 1,954.38 and 786.85

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Solution

The fourth proportional to 1,416.31, 1,954.38 and 786.85 is: 1,085.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,416.31 : 1,954.38 = 786.85 : x
  2. Step 2: Convert to fraction form
    1,416.31/1,954.38 = 786.85/x
  3. Step 3: Cross multiply
    1,416.31x = 1,954.38 × 786.85
  4. Step 4: Simplify right side
    1,416.31x = 1,537,803.90
  5. Step 5: Solve for x
    x = 1,537,803.90/1,416.31
  6. Step 6: Final answer
    x = 1,085.78

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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.