Home / 638,438.20-955,814.10-389,606.20

Finding the Fourth Proportional to 638,438.20, 955,814.10 and 389,606.20

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Solution

The fourth proportional to 638,438.20, 955,814.10 and 389,606.20 is: 583,284.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,438.20 : 955,814.10 = 389,606.20 : x
  2. Step 2: Convert to fraction form
    638,438.20/955,814.10 = 389,606.20/x
  3. Step 3: Cross multiply
    638,438.20x = 955,814.10 × 389,606.20
  4. Step 4: Simplify right side
    638,438.20x = 372,391,099,407.42
  5. Step 5: Solve for x
    x = 372,391,099,407.42/638,438.20
  6. Step 6: Final answer
    x = 583,284.49

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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.