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Finding the Fourth Proportional to 245,128.60, 367,431.30 and 139,720.60

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Solution

The fourth proportional to 245,128.60, 367,431.30 and 139,720.60 is: 209,431.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,128.60 : 367,431.30 = 139,720.60 : x
  2. Step 2: Convert to fraction form
    245,128.60/367,431.30 = 139,720.60/x
  3. Step 3: Cross multiply
    245,128.60x = 367,431.30 × 139,720.60
  4. Step 4: Simplify right side
    245,128.60x = 51,337,721,694.78
  5. Step 5: Solve for x
    x = 51,337,721,694.78/245,128.60
  6. Step 6: Final answer
    x = 209,431.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.