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Finding the Fourth Proportional to 788.85, 1,085.81 and 555.57

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Solution

The fourth proportional to 788.85, 1,085.81 and 555.57 is: 764.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.85 : 1,085.81 = 555.57 : x
  2. Step 2: Convert to fraction form
    788.85/1,085.81 = 555.57/x
  3. Step 3: Cross multiply
    788.85x = 1,085.81 × 555.57
  4. Step 4: Simplify right side
    788.85x = 603,240.68
  5. Step 5: Solve for x
    x = 603,240.68/788.85
  6. Step 6: Final answer
    x = 764.71

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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.