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Finding the Fourth Proportional to 630,534.89, 869,910.78 and 485,385.07

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Solution

The fourth proportional to 630,534.89, 869,910.78 and 485,385.07 is: 669,656.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    630,534.89 : 869,910.78 = 485,385.07 : x
  2. Step 2: Convert to fraction form
    630,534.89/869,910.78 = 485,385.07/x
  3. Step 3: Cross multiply
    630,534.89x = 869,910.78 × 485,385.07
  4. Step 4: Simplify right side
    630,534.89x = 422,241,704,844.06
  5. Step 5: Solve for x
    x = 422,241,704,844.06/630,534.89
  6. Step 6: Final answer
    x = 669,656.37

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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.