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Finding the Fourth Proportional to 709,021.41, 978,452.60 and 386,738.43

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Solution

The fourth proportional to 709,021.41, 978,452.60 and 386,738.43 is: 533,700.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,021.41 : 978,452.60 = 386,738.43 : x
  2. Step 2: Convert to fraction form
    709,021.41/978,452.60 = 386,738.43/x
  3. Step 3: Cross multiply
    709,021.41x = 978,452.60 × 386,738.43
  4. Step 4: Simplify right side
    709,021.41x = 378,405,222,353.42
  5. Step 5: Solve for x
    x = 378,405,222,353.42/709,021.41
  6. Step 6: Final answer
    x = 533,700.70

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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.