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Finding the Fourth Proportional to 426,896.20, 640,344.30 and 357,430.60

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Solution

The fourth proportional to 426,896.20, 640,344.30 and 357,430.60 is: 536,145.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,896.20 : 640,344.30 = 357,430.60 : x
  2. Step 2: Convert to fraction form
    426,896.20/640,344.30 = 357,430.60/x
  3. Step 3: Cross multiply
    426,896.20x = 640,344.30 × 357,430.60
  4. Step 4: Simplify right side
    426,896.20x = 228,878,647,355.58
  5. Step 5: Solve for x
    x = 228,878,647,355.58/426,896.20
  6. Step 6: Final answer
    x = 536,145.90

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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.