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Finding the Fourth Proportional to 309,855.64, 427,990.53 and 255,604.40

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Solution

The fourth proportional to 309,855.64, 427,990.53 and 255,604.40 is: 353,055.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,855.64 : 427,990.53 = 255,604.40 : x
  2. Step 2: Convert to fraction form
    309,855.64/427,990.53 = 255,604.40/x
  3. Step 3: Cross multiply
    309,855.64x = 427,990.53 × 255,604.40
  4. Step 4: Simplify right side
    309,855.64x = 109,396,262,626.33
  5. Step 5: Solve for x
    x = 109,396,262,626.33/309,855.64
  6. Step 6: Final answer
    x = 353,055.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.