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Finding the Fourth Proportional to 428,438.89, 591,222.88 and 247,139.99

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Solution

The fourth proportional to 428,438.89, 591,222.88 and 247,139.99 is: 341,040.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,438.89 : 591,222.88 = 247,139.99 : x
  2. Step 2: Convert to fraction form
    428,438.89/591,222.88 = 247,139.99/x
  3. Step 3: Cross multiply
    428,438.89x = 591,222.88 × 247,139.99
  4. Step 4: Simplify right side
    428,438.89x = 146,114,816,650.97
  5. Step 5: Solve for x
    x = 146,114,816,650.97/428,438.89
  6. Step 6: Final answer
    x = 341,040.04

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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.