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Finding the Fourth Proportional to 428,286.40, 591,019.40 and 247,005.92

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Solution

The fourth proportional to 428,286.40, 591,019.40 and 247,005.92 is: 340,859.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,286.40 : 591,019.40 = 247,005.92 : x
  2. Step 2: Convert to fraction form
    428,286.40/591,019.40 = 247,005.92/x
  3. Step 3: Cross multiply
    428,286.40x = 591,019.40 × 247,005.92
  4. Step 4: Simplify right side
    428,286.40x = 145,985,290,634.85
  5. Step 5: Solve for x
    x = 145,985,290,634.85/428,286.40
  6. Step 6: Final answer
    x = 340,859.04

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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.