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Finding the Fourth Proportional to 438,809.28, 658,313.28 and 139,308

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Solution

The fourth proportional to 438,809.28, 658,313.28 and 139,308 is: 208,993.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,809.28 : 658,313.28 = 139,308 : x
  2. Step 2: Convert to fraction form
    438,809.28/658,313.28 = 139,308/x
  3. Step 3: Cross multiply
    438,809.28x = 658,313.28 × 139,308
  4. Step 4: Simplify right side
    438,809.28x = 91,708,306,410.24
  5. Step 5: Solve for x
    x = 91,708,306,410.24/438,809.28
  6. Step 6: Final answer
    x = 208,993.54

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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.