Home / 686,739.70-1,030,109.55-213,421.30

Finding the Fourth Proportional to 686,739.70, 1,030,109.55 and 213,421.30

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Solution

The fourth proportional to 686,739.70, 1,030,109.55 and 213,421.30 is: 320,131.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,739.70 : 1,030,109.55 = 213,421.30 : x
  2. Step 2: Convert to fraction form
    686,739.70/1,030,109.55 = 213,421.30/x
  3. Step 3: Cross multiply
    686,739.70x = 1,030,109.55 × 213,421.30
  4. Step 4: Simplify right side
    686,739.70x = 219,847,319,303.42
  5. Step 5: Solve for x
    x = 219,847,319,303.42/686,739.70
  6. Step 6: Final answer
    x = 320,131.95

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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.