Home / 212,639.68-318,848.80-100,289.76

Finding the Fourth Proportional to 212,639.68, 318,848.80 and 100,289.76

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Solution

The fourth proportional to 212,639.68, 318,848.80 and 100,289.76 is: 150,382.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,639.68 : 318,848.80 = 100,289.76 : x
  2. Step 2: Convert to fraction form
    212,639.68/318,848.80 = 100,289.76/x
  3. Step 3: Cross multiply
    212,639.68x = 318,848.80 × 100,289.76
  4. Step 4: Simplify right side
    212,639.68x = 31,977,269,628.29
  5. Step 5: Solve for x
    x = 31,977,269,628.29/212,639.68
  6. Step 6: Final answer
    x = 150,382.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.