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Finding the Fourth Proportional to 1,388,708.88, 1,916,341.16 and 776,743.44

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Solution

The fourth proportional to 1,388,708.88, 1,916,341.16 and 776,743.44 is: 1,071,862.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388,708.88 : 1,916,341.16 = 776,743.44 : x
  2. Step 2: Convert to fraction form
    1,388,708.88/1,916,341.16 = 776,743.44/x
  3. Step 3: Cross multiply
    1,388,708.88x = 1,916,341.16 × 776,743.44
  4. Step 4: Simplify right side
    1,388,708.88x = 1,488,505,424,831.99
  5. Step 5: Solve for x
    x = 1,488,505,424,831.99/1,388,708.88
  6. Step 6: Final answer
    x = 1,071,862.83

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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.