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Finding the Fourth Proportional to 774.12, 1,066.68 and 720.60

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Solution

The fourth proportional to 774.12, 1,066.68 and 720.60 is: 992.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.12 : 1,066.68 = 720.60 : x
  2. Step 2: Convert to fraction form
    774.12/1,066.68 = 720.60/x
  3. Step 3: Cross multiply
    774.12x = 1,066.68 × 720.60
  4. Step 4: Simplify right side
    774.12x = 768,649.61
  5. Step 5: Solve for x
    x = 768,649.61/774.12
  6. Step 6: Final answer
    x = 992.93

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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.