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Finding the Fourth Proportional to 426,118.60, 638,400.30 and 259,712.20

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Solution

The fourth proportional to 426,118.60, 638,400.30 and 259,712.20 is: 389,094.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,118.60 : 638,400.30 = 259,712.20 : x
  2. Step 2: Convert to fraction form
    426,118.60/638,400.30 = 259,712.20/x
  3. Step 3: Cross multiply
    426,118.60x = 638,400.30 × 259,712.20
  4. Step 4: Simplify right side
    426,118.60x = 165,800,346,393.66
  5. Step 5: Solve for x
    x = 165,800,346,393.66/426,118.60
  6. Step 6: Final answer
    x = 389,094.37

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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.