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Finding the Fourth Proportional to 665,939,128.80, 998,908,693.20 and 654,460,003.20

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Solution

The fourth proportional to 665,939,128.80, 998,908,693.20 and 654,460,003.20 is: 981,690,004.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,939,128.80 : 998,908,693.20 = 654,460,003.20 : x
  2. Step 2: Convert to fraction form
    665,939,128.80/998,908,693.20 = 654,460,003.20/x
  3. Step 3: Cross multiply
    665,939,128.80x = 998,908,693.20 × 654,460,003.20
  4. Step 4: Simplify right side
    665,939,128.80x = 653,745,786,548,179,840
  5. Step 5: Solve for x
    x = 653,745,786,548,179,840/665,939,128.80
  6. Step 6: Final answer
    x = 981,690,004.80

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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.