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Finding the Fourth Proportional to 786.35, 1,085.28 and 454.79

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Solution

The fourth proportional to 786.35, 1,085.28 and 454.79 is: 627.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.35 : 1,085.28 = 454.79 : x
  2. Step 2: Convert to fraction form
    786.35/1,085.28 = 454.79/x
  3. Step 3: Cross multiply
    786.35x = 1,085.28 × 454.79
  4. Step 4: Simplify right side
    786.35x = 493,574.49
  5. Step 5: Solve for x
    x = 493,574.49/786.35
  6. Step 6: Final answer
    x = 627.68

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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.