Home / 426,200.40-638,976.60-215,989.20

Finding the Fourth Proportional to 426,200.40, 638,976.60 and 215,989.20

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Solution

The fourth proportional to 426,200.40, 638,976.60 and 215,989.20 is: 323,819.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,200.40 : 638,976.60 = 215,989.20 : x
  2. Step 2: Convert to fraction form
    426,200.40/638,976.60 = 215,989.20/x
  3. Step 3: Cross multiply
    426,200.40x = 638,976.60 × 215,989.20
  4. Step 4: Simplify right side
    426,200.40x = 138,012,044,652.72
  5. Step 5: Solve for x
    x = 138,012,044,652.72/426,200.40
  6. Step 6: Final answer
    x = 323,819.60

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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.