Home / 428,747.60-643,121.40-148,235.60

Finding the Fourth Proportional to 428,747.60, 643,121.40 and 148,235.60

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Solution

The fourth proportional to 428,747.60, 643,121.40 and 148,235.60 is: 222,353.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,747.60 : 643,121.40 = 148,235.60 : x
  2. Step 2: Convert to fraction form
    428,747.60/643,121.40 = 148,235.60/x
  3. Step 3: Cross multiply
    428,747.60x = 643,121.40 × 148,235.60
  4. Step 4: Simplify right side
    428,747.60x = 95,333,486,601.84
  5. Step 5: Solve for x
    x = 95,333,486,601.84/428,747.60
  6. Step 6: Final answer
    x = 222,353.40

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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.