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Finding the Fourth Proportional to 1,388,741.97, 1,916,419.44 and 776,881.56

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Solution

The fourth proportional to 1,388,741.97, 1,916,419.44 and 776,881.56 is: 1,072,071.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388,741.97 : 1,916,419.44 = 776,881.56 : x
  2. Step 2: Convert to fraction form
    1,388,741.97/1,916,419.44 = 776,881.56/x
  3. Step 3: Cross multiply
    1,388,741.97x = 1,916,419.44 × 776,881.56
  4. Step 4: Simplify right side
    1,388,741.97x = 1,488,830,929,891.45
  5. Step 5: Solve for x
    x = 1,488,830,929,891.45/1,388,741.97
  6. Step 6: Final answer
    x = 1,072,071.68

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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.