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Finding the Fourth Proportional to 521,810.40, 719,780.07 and 345,000.21

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Solution

The fourth proportional to 521,810.40, 719,780.07 and 345,000.21 is: 475,889.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,810.40 : 719,780.07 = 345,000.21 : x
  2. Step 2: Convert to fraction form
    521,810.40/719,780.07 = 345,000.21/x
  3. Step 3: Cross multiply
    521,810.40x = 719,780.07 × 345,000.21
  4. Step 4: Simplify right side
    521,810.40x = 248,324,275,303.82
  5. Step 5: Solve for x
    x = 248,324,275,303.82/521,810.40
  6. Step 6: Final answer
    x = 475,889.85

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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.