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Finding the Fourth Proportional to 663,445.11, 915,751.18 and 430,865.76

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Solution

The fourth proportional to 663,445.11, 915,751.18 and 430,865.76 is: 594,722.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,445.11 : 915,751.18 = 430,865.76 : x
  2. Step 2: Convert to fraction form
    663,445.11/915,751.18 = 430,865.76/x
  3. Step 3: Cross multiply
    663,445.11x = 915,751.18 × 430,865.76
  4. Step 4: Simplify right side
    663,445.11x = 394,565,828,141.60
  5. Step 5: Solve for x
    x = 394,565,828,141.60/663,445.11
  6. Step 6: Final answer
    x = 594,722.64

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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.