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Finding the Fourth Proportional to 1,388,942.60, 1,916,730.42 and 785,352.20

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Solution

The fourth proportional to 1,388,942.60, 1,916,730.42 and 785,352.20 is: 1,083,780.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388,942.60 : 1,916,730.42 = 785,352.20 : x
  2. Step 2: Convert to fraction form
    1,388,942.60/1,916,730.42 = 785,352.20/x
  3. Step 3: Cross multiply
    1,388,942.60x = 1,916,730.42 × 785,352.20
  4. Step 4: Simplify right side
    1,388,942.60x = 1,505,308,452,153.92
  5. Step 5: Solve for x
    x = 1,505,308,452,153.92/1,388,942.60
  6. Step 6: Final answer
    x = 1,083,780.17

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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.