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Finding the Fourth Proportional to 850.63, 1,173.55 and 555.79

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Solution

The fourth proportional to 850.63, 1,173.55 and 555.79 is: 766.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.63 : 1,173.55 = 555.79 : x
  2. Step 2: Convert to fraction form
    850.63/1,173.55 = 555.79/x
  3. Step 3: Cross multiply
    850.63x = 1,173.55 × 555.79
  4. Step 4: Simplify right side
    850.63x = 652,247.35
  5. Step 5: Solve for x
    x = 652,247.35/850.63
  6. Step 6: Final answer
    x = 766.78

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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.