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Finding the Fourth Proportional to 774.78, 1,070.01 and 539.31

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Solution

The fourth proportional to 774.78, 1,070.01 and 539.31 is: 744.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.78 : 1,070.01 = 539.31 : x
  2. Step 2: Convert to fraction form
    774.78/1,070.01 = 539.31/x
  3. Step 3: Cross multiply
    774.78x = 1,070.01 × 539.31
  4. Step 4: Simplify right side
    774.78x = 577,067.09
  5. Step 5: Solve for x
    x = 577,067.09/774.78
  6. Step 6: Final answer
    x = 744.81

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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.