Home / 720,028,311-993,639,103.20-390,003,450

Finding the Fourth Proportional to 720,028,311, 993,639,103.20 and 390,003,450

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Solution

The fourth proportional to 720,028,311, 993,639,103.20 and 390,003,450 is: 538,204,779.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,028,311 : 993,639,103.20 = 390,003,450 : x
  2. Step 2: Convert to fraction form
    720,028,311/993,639,103.20 = 390,003,450/x
  3. Step 3: Cross multiply
    720,028,311x = 993,639,103.20 × 390,003,450
  4. Step 4: Simplify right side
    720,028,311x = 387,522,678,302,906,048
  5. Step 5: Solve for x
    x = 387,522,678,302,906,048/720,028,311
  6. Step 6: Final answer
    x = 538,204,779.43

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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.