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Finding the Fourth Proportional to 774.09, 1,065.69 and 670.55

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Solution

The fourth proportional to 774.09, 1,065.69 and 670.55 is: 923.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.09 : 1,065.69 = 670.55 : x
  2. Step 2: Convert to fraction form
    774.09/1,065.69 = 670.55/x
  3. Step 3: Cross multiply
    774.09x = 1,065.69 × 670.55
  4. Step 4: Simplify right side
    774.09x = 714,593.10
  5. Step 5: Solve for x
    x = 714,593.10/774.09
  6. Step 6: Final answer
    x = 923.14

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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.