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Finding the Fourth Proportional to 786.37, 1,085.97 and 647.86

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Solution

The fourth proportional to 786.37, 1,085.97 and 647.86 is: 894.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.37 : 1,085.97 = 647.86 : x
  2. Step 2: Convert to fraction form
    786.37/1,085.97 = 647.86/x
  3. Step 3: Cross multiply
    786.37x = 1,085.97 × 647.86
  4. Step 4: Simplify right side
    786.37x = 703,551.09
  5. Step 5: Solve for x
    x = 703,551.09/786.37
  6. Step 6: Final answer
    x = 894.69

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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.