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Finding the Fourth Proportional to 686,499.78, 947,369.65 and 380,575.39

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Solution

The fourth proportional to 686,499.78, 947,369.65 and 380,575.39 is: 525,194.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,499.78 : 947,369.65 = 380,575.39 : x
  2. Step 2: Convert to fraction form
    686,499.78/947,369.65 = 380,575.39/x
  3. Step 3: Cross multiply
    686,499.78x = 947,369.65 × 380,575.39
  4. Step 4: Simplify right side
    686,499.78x = 360,545,567,383.19
  5. Step 5: Solve for x
    x = 360,545,567,383.19/686,499.78
  6. Step 6: Final answer
    x = 525,194.00

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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.