Home / 686,820.12-1,030,405.40-213,509.58

Finding the Fourth Proportional to 686,820.12, 1,030,405.40 and 213,509.58

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Solution

The fourth proportional to 686,820.12, 1,030,405.40 and 213,509.58 is: 320,318.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,820.12 : 1,030,405.40 = 213,509.58 : x
  2. Step 2: Convert to fraction form
    686,820.12/1,030,405.40 = 213,509.58/x
  3. Step 3: Cross multiply
    686,820.12x = 1,030,405.40 × 213,509.58
  4. Step 4: Simplify right side
    686,820.12x = 220,001,424,183.73
  5. Step 5: Solve for x
    x = 220,001,424,183.73/686,820.12
  6. Step 6: Final answer
    x = 320,318.84

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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.