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Finding the Fourth Proportional to 318,089.54, 438,921.10 and 197,186.78

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Solution

The fourth proportional to 318,089.54, 438,921.10 and 197,186.78 is: 272,091.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,089.54 : 438,921.10 = 197,186.78 : x
  2. Step 2: Convert to fraction form
    318,089.54/438,921.10 = 197,186.78/x
  3. Step 3: Cross multiply
    318,089.54x = 438,921.10 × 197,186.78
  4. Step 4: Simplify right side
    318,089.54x = 86,549,438,383.06
  5. Step 5: Solve for x
    x = 86,549,438,383.06/318,089.54
  6. Step 6: Final answer
    x = 272,091.43

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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.