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Finding the Fourth Proportional to 426,343.80, 638,286.90 and 260,455.80

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Solution

The fourth proportional to 426,343.80, 638,286.90 and 260,455.80 is: 389,933.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,343.80 : 638,286.90 = 260,455.80 : x
  2. Step 2: Convert to fraction form
    426,343.80/638,286.90 = 260,455.80/x
  3. Step 3: Cross multiply
    426,343.80x = 638,286.90 × 260,455.80
  4. Step 4: Simplify right side
    426,343.80x = 166,245,525,169.02
  5. Step 5: Solve for x
    x = 166,245,525,169.02/426,343.80
  6. Step 6: Final answer
    x = 389,933.02

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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.