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Finding the Fourth Proportional to 90,819, 125,330.76 and 51,075

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Solution

The fourth proportional to 90,819, 125,330.76 and 51,075 is: 70,483.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,819 : 125,330.76 = 51,075 : x
  2. Step 2: Convert to fraction form
    90,819/125,330.76 = 51,075/x
  3. Step 3: Cross multiply
    90,819x = 125,330.76 × 51,075
  4. Step 4: Simplify right side
    90,819x = 6,401,268,567
  5. Step 5: Solve for x
    x = 6,401,268,567/90,819
  6. Step 6: Final answer
    x = 70,483.80

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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.