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Finding the Fourth Proportional to 639,980.78, 883,156.56 and 353,494.72

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Solution

The fourth proportional to 639,980.78, 883,156.56 and 353,494.72 is: 487,813.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,980.78 : 883,156.56 = 353,494.72 : x
  2. Step 2: Convert to fraction form
    639,980.78/883,156.56 = 353,494.72/x
  3. Step 3: Cross multiply
    639,980.78x = 883,156.56 × 353,494.72
  4. Step 4: Simplify right side
    639,980.78x = 312,191,176,477.58
  5. Step 5: Solve for x
    x = 312,191,176,477.58/639,980.78
  6. Step 6: Final answer
    x = 487,813.36

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Double scale
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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.