Home / 686,709.40-1,030,220.70-213,442.60

Finding the Fourth Proportional to 686,709.40, 1,030,220.70 and 213,442.60

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Solution

The fourth proportional to 686,709.40, 1,030,220.70 and 213,442.60 is: 320,212.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,709.40 : 1,030,220.70 = 213,442.60 : x
  2. Step 2: Convert to fraction form
    686,709.40/1,030,220.70 = 213,442.60/x
  3. Step 3: Cross multiply
    686,709.40x = 1,030,220.70 × 213,442.60
  4. Step 4: Simplify right side
    686,709.40x = 219,892,984,781.82
  5. Step 5: Solve for x
    x = 219,892,984,781.82/686,709.40
  6. Step 6: Final answer
    x = 320,212.57

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1.5x scale

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.