Home / 428,991,020.13-643,390,768.76-198,930,211.23

Finding the Fourth Proportional to 428,991,020.13, 643,390,768.76 and 198,930,211.23

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Solution

The fourth proportional to 428,991,020.13, 643,390,768.76 and 198,930,211.23 is: 298,350,910.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,991,020.13 : 643,390,768.76 = 198,930,211.23 : x
  2. Step 2: Convert to fraction form
    428,991,020.13/643,390,768.76 = 198,930,211.23/x
  3. Step 3: Cross multiply
    428,991,020.13x = 643,390,768.76 × 198,930,211.23
  4. Step 4: Simplify right side
    428,991,020.13x = 127,989,861,531,864,224
  5. Step 5: Solve for x
    x = 127,989,861,531,864,224/428,991,020.13
  6. Step 6: Final answer
    x = 298,350,910.69

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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.