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Finding the Fourth Proportional to 720,028,314, 993,639,107.34 and 390,003,453

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Solution

The fourth proportional to 720,028,314, 993,639,107.34 and 390,003,453 is: 538,204,783.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,028,314 : 993,639,107.34 = 390,003,453 : x
  2. Step 2: Convert to fraction form
    720,028,314/993,639,107.34 = 390,003,453/x
  3. Step 3: Cross multiply
    720,028,314x = 993,639,107.34 × 390,003,453
  4. Step 4: Simplify right side
    720,028,314x = 387,522,682,898,437,632
  5. Step 5: Solve for x
    x = 387,522,682,898,437,632/720,028,314
  6. Step 6: Final answer
    x = 538,204,783.57

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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.