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Finding the Fourth Proportional to 1,379,942.72, 1,904,313.12 and 776,335.68

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Solution

The fourth proportional to 1,379,942.72, 1,904,313.12 and 776,335.68 is: 1,071,338.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379,942.72 : 1,904,313.12 = 776,335.68 : x
  2. Step 2: Convert to fraction form
    1,379,942.72/1,904,313.12 = 776,335.68/x
  3. Step 3: Cross multiply
    1,379,942.72x = 1,904,313.12 × 776,335.68
  4. Step 4: Simplify right side
    1,379,942.72x = 1,478,386,220,948.12
  5. Step 5: Solve for x
    x = 1,478,386,220,948.12/1,379,942.72
  6. Step 6: Final answer
    x = 1,071,338.83

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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.