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Finding the Fourth Proportional to 621,511.64, 857,681.28 and 353,239.64

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Solution

The fourth proportional to 621,511.64, 857,681.28 and 353,239.64 is: 487,467.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,511.64 : 857,681.28 = 353,239.64 : x
  2. Step 2: Convert to fraction form
    621,511.64/857,681.28 = 353,239.64/x
  3. Step 3: Cross multiply
    621,511.64x = 857,681.28 × 353,239.64
  4. Step 4: Simplify right side
    621,511.64x = 302,967,026,581.94
  5. Step 5: Solve for x
    x = 302,967,026,581.94/621,511.64
  6. Step 6: Final answer
    x = 487,467.98

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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.