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Finding the Fourth Proportional to 90,648, 125,075.28 and 54,831

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Solution

The fourth proportional to 90,648, 125,075.28 and 54,831 is: 75,655.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,648 : 125,075.28 = 54,831 : x
  2. Step 2: Convert to fraction form
    90,648/125,075.28 = 54,831/x
  3. Step 3: Cross multiply
    90,648x = 125,075.28 × 54,831
  4. Step 4: Simplify right side
    90,648x = 6,858,002,677.68
  5. Step 5: Solve for x
    x = 6,858,002,677.68/90,648
  6. Step 6: Final answer
    x = 75,655.31

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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.