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Finding the Fourth Proportional to 520,455.30, 779,516.55 and 427,143.30

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Solution

The fourth proportional to 520,455.30, 779,516.55 and 427,143.30 is: 639,757.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,455.30 : 779,516.55 = 427,143.30 : x
  2. Step 2: Convert to fraction form
    520,455.30/779,516.55 = 427,143.30/x
  3. Step 3: Cross multiply
    520,455.30x = 779,516.55 × 427,143.30
  4. Step 4: Simplify right side
    520,455.30x = 332,965,271,571.62
  5. Step 5: Solve for x
    x = 332,965,271,571.62/520,455.30
  6. Step 6: Final answer
    x = 639,757.67

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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.