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Finding the Fourth Proportional to 721,743,230.78, 996,006,619.60 and 391,718,369.78

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Solution

The fourth proportional to 721,743,230.78, 996,006,619.60 and 391,718,369.78 is: 540,571,871.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,743,230.78 : 996,006,619.60 = 391,718,369.78 : x
  2. Step 2: Convert to fraction form
    721,743,230.78/996,006,619.60 = 391,718,369.78/x
  3. Step 3: Cross multiply
    721,743,230.78x = 996,006,619.60 × 391,718,369.78
  4. Step 4: Simplify right side
    721,743,230.78x = 390,154,089,319,800,576
  5. Step 5: Solve for x
    x = 390,154,089,319,800,576/721,743,230.78
  6. Step 6: Final answer
    x = 540,571,871.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.