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Finding the Fourth Proportional to 519,390.11, 780,455.10 and 279,681.23

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Solution

The fourth proportional to 519,390.11, 780,455.10 and 279,681.23 is: 420,259.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,390.11 : 780,455.10 = 279,681.23 : x
  2. Step 2: Convert to fraction form
    519,390.11/780,455.10 = 279,681.23/x
  3. Step 3: Cross multiply
    519,390.11x = 780,455.10 × 279,681.23
  4. Step 4: Simplify right side
    519,390.11x = 218,278,638,425.50
  5. Step 5: Solve for x
    x = 218,278,638,425.50/519,390.11
  6. Step 6: Final answer
    x = 420,259.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.