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Finding the Fourth Proportional to 418,819.20, 628,228.80 and 259,386.90

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Solution

The fourth proportional to 418,819.20, 628,228.80 and 259,386.90 is: 389,080.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,819.20 : 628,228.80 = 259,386.90 : x
  2. Step 2: Convert to fraction form
    418,819.20/628,228.80 = 259,386.90/x
  3. Step 3: Cross multiply
    418,819.20x = 628,228.80 × 259,386.90
  4. Step 4: Simplify right side
    418,819.20x = 162,954,320,922.72
  5. Step 5: Solve for x
    x = 162,954,320,922.72/418,819.20
  6. Step 6: Final answer
    x = 389,080.35

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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.