Home / 685,855.28-1,028,407.08-212,409.20

Finding the Fourth Proportional to 685,855.28, 1,028,407.08 and 212,409.20

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Solution

The fourth proportional to 685,855.28, 1,028,407.08 and 212,409.20 is: 318,497.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,855.28 : 1,028,407.08 = 212,409.20 : x
  2. Step 2: Convert to fraction form
    685,855.28/1,028,407.08 = 212,409.20/x
  3. Step 3: Cross multiply
    685,855.28x = 1,028,407.08 × 212,409.20
  4. Step 4: Simplify right side
    685,855.28x = 218,443,125,137.14
  5. Step 5: Solve for x
    x = 218,443,125,137.14/685,855.28
  6. Step 6: Final answer
    x = 318,497.40

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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.