Home / 387,820,489.72-581,687,762.49-138,815,802.07

Finding the Fourth Proportional to 387,820,489.72, 581,687,762.49 and 138,815,802.07

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Solution

The fourth proportional to 387,820,489.72, 581,687,762.49 and 138,815,802.07 is: 208,208,321.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,820,489.72 : 581,687,762.49 = 138,815,802.07 : x
  2. Step 2: Convert to fraction form
    387,820,489.72/581,687,762.49 = 138,815,802.07/x
  3. Step 3: Cross multiply
    387,820,489.72x = 581,687,762.49 × 138,815,802.07
  4. Step 4: Simplify right side
    387,820,489.72x = 80,747,453,304,353,008
  5. Step 5: Solve for x
    x = 80,747,453,304,353,008/387,820,489.72
  6. Step 6: Final answer
    x = 208,208,321.75

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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.