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Finding the Fourth Proportional to 663,624.46, 915,775.37 and 391,779.92

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Solution

The fourth proportional to 663,624.46, 915,775.37 and 391,779.92 is: 540,640.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,624.46 : 915,775.37 = 391,779.92 : x
  2. Step 2: Convert to fraction form
    663,624.46/915,775.37 = 391,779.92/x
  3. Step 3: Cross multiply
    663,624.46x = 915,775.37 × 391,779.92
  4. Step 4: Simplify right side
    663,624.46x = 358,782,401,196.57
  5. Step 5: Solve for x
    x = 358,782,401,196.57/663,624.46
  6. Step 6: Final answer
    x = 540,640.71

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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.