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Finding the Fourth Proportional to 718,703.60, 991,806.93 and 396,412.97

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Solution

The fourth proportional to 718,703.60, 991,806.93 and 396,412.97 is: 547,047.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,703.60 : 991,806.93 = 396,412.97 : x
  2. Step 2: Convert to fraction form
    718,703.60/991,806.93 = 396,412.97/x
  3. Step 3: Cross multiply
    718,703.60x = 991,806.93 × 396,412.97
  4. Step 4: Simplify right side
    718,703.60x = 393,165,125,828.85
  5. Step 5: Solve for x
    x = 393,165,125,828.85/718,703.60
  6. Step 6: Final answer
    x = 547,047.67

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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.