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Finding the Fourth Proportional to 639,888.92, 883,028.55 and 353,402.86

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Solution

The fourth proportional to 639,888.92, 883,028.55 and 353,402.86 is: 487,685.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,888.92 : 883,028.55 = 353,402.86 : x
  2. Step 2: Convert to fraction form
    639,888.92/883,028.55 = 353,402.86/x
  3. Step 3: Cross multiply
    639,888.92x = 883,028.55 × 353,402.86
  4. Step 4: Simplify right side
    639,888.92x = 312,064,815,031.65
  5. Step 5: Solve for x
    x = 312,064,815,031.65/639,888.92
  6. Step 6: Final answer
    x = 487,685.92

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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.