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Finding the Fourth Proportional to 639,686.40, 882,763.44 and 353,204.16

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Solution

The fourth proportional to 639,686.40, 882,763.44 and 353,204.16 is: 487,419.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,686.40 : 882,763.44 = 353,204.16 : x
  2. Step 2: Convert to fraction form
    639,686.40/882,763.44 = 353,204.16/x
  3. Step 3: Cross multiply
    639,686.40x = 882,763.44 × 353,204.16
  4. Step 4: Simplify right side
    639,686.40x = 311,795,719,303.91
  5. Step 5: Solve for x
    x = 311,795,719,303.91/639,686.40
  6. Step 6: Final answer
    x = 487,419.65

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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.