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Finding the Fourth Proportional to 411,643.20, 618,501.60 and 261,955.20

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Solution

The fourth proportional to 411,643.20, 618,501.60 and 261,955.20 is: 393,592.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    411,643.20 : 618,501.60 = 261,955.20 : x
  2. Step 2: Convert to fraction form
    411,643.20/618,501.60 = 261,955.20/x
  3. Step 3: Cross multiply
    411,643.20x = 618,501.60 × 261,955.20
  4. Step 4: Simplify right side
    411,643.20x = 162,019,710,328.32
  5. Step 5: Solve for x
    x = 162,019,710,328.32/411,643.20
  6. Step 6: Final answer
    x = 393,592.58

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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.