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Finding the Fourth Proportional to 786.56, 1,085.34 and 454.91

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Solution

The fourth proportional to 786.56, 1,085.34 and 454.91 is: 627.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.56 : 1,085.34 = 454.91 : x
  2. Step 2: Convert to fraction form
    786.56/1,085.34 = 454.91/x
  3. Step 3: Cross multiply
    786.56x = 1,085.34 × 454.91
  4. Step 4: Simplify right side
    786.56x = 493,732.02
  5. Step 5: Solve for x
    x = 493,732.02/786.56
  6. Step 6: Final answer
    x = 627.71

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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.