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Finding the Fourth Proportional to 1,211,438, 1,671,819 and 674,928.56

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Solution

The fourth proportional to 1,211,438, 1,671,819 and 674,928.56 is: 931,420.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211,438 : 1,671,819 = 674,928.56 : x
  2. Step 2: Convert to fraction form
    1,211,438/1,671,819 = 674,928.56/x
  3. Step 3: Cross multiply
    1,211,438x = 1,671,819 × 674,928.56
  4. Step 4: Simplify right side
    1,211,438x = 1,128,358,390,250.64
  5. Step 5: Solve for x
    x = 1,128,358,390,250.64/1,211,438
  6. Step 6: Final answer
    x = 931,420.67

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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.