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Finding the Fourth Proportional to 641,430.45, 885,113.91 and 383,256

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Solution

The fourth proportional to 641,430.45, 885,113.91 and 383,256 is: 528,857.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,430.45 : 885,113.91 = 383,256 : x
  2. Step 2: Convert to fraction form
    641,430.45/885,113.91 = 383,256/x
  3. Step 3: Cross multiply
    641,430.45x = 885,113.91 × 383,256
  4. Step 4: Simplify right side
    641,430.45x = 339,225,216,690.96
  5. Step 5: Solve for x
    x = 339,225,216,690.96/641,430.45
  6. Step 6: Final answer
    x = 528,857.36

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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.