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Finding the Fourth Proportional to 1,379,943.72, 1,904,314.50 and 776,336.68

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Solution

The fourth proportional to 1,379,943.72, 1,904,314.50 and 776,336.68 is: 1,071,340.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379,943.72 : 1,904,314.50 = 776,336.68 : x
  2. Step 2: Convert to fraction form
    1,379,943.72/1,904,314.50 = 776,336.68/x
  3. Step 3: Cross multiply
    1,379,943.72x = 1,904,314.50 × 776,336.68
  4. Step 4: Simplify right side
    1,379,943.72x = 1,478,389,196,605.86
  5. Step 5: Solve for x
    x = 1,478,389,196,605.86/1,379,943.72
  6. Step 6: Final answer
    x = 1,071,340.21

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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.