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Finding the Fourth Proportional to 425,655,958.62, 638,177,509.05 and 261,554,667.77

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Solution

The fourth proportional to 425,655,958.62, 638,177,509.05 and 261,554,667.77 is: 392,143,708.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,655,958.62 : 638,177,509.05 = 261,554,667.77 : x
  2. Step 2: Convert to fraction form
    425,655,958.62/638,177,509.05 = 261,554,667.77/x
  3. Step 3: Cross multiply
    425,655,958.62x = 638,177,509.05 × 261,554,667.77
  4. Step 4: Simplify right side
    425,655,958.62x = 166,918,306,354,668,000
  5. Step 5: Solve for x
    x = 166,918,306,354,668,000/425,655,958.62
  6. Step 6: Final answer
    x = 392,143,708.96

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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.