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Finding the Fourth Proportional to 665,928,005.20, 998,892,007.80 and 620,578,373.20

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Solution

The fourth proportional to 665,928,005.20, 998,892,007.80 and 620,578,373.20 is: 930,867,559.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,928,005.20 : 998,892,007.80 = 620,578,373.20 : x
  2. Step 2: Convert to fraction form
    665,928,005.20/998,892,007.80 = 620,578,373.20/x
  3. Step 3: Cross multiply
    665,928,005.20x = 998,892,007.80 × 620,578,373.20
  4. Step 4: Simplify right side
    665,928,005.20x = 619,890,777,203,005,696
  5. Step 5: Solve for x
    x = 619,890,777,203,005,696/665,928,005.20
  6. Step 6: Final answer
    x = 930,867,559.80

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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.