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Finding the Fourth Proportional to 1,388,799.36, 1,916,525.88 and 815,891.76

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Solution

The fourth proportional to 1,388,799.36, 1,916,525.88 and 815,891.76 is: 1,125,920.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388,799.36 : 1,916,525.88 = 815,891.76 : x
  2. Step 2: Convert to fraction form
    1,388,799.36/1,916,525.88 = 815,891.76/x
  3. Step 3: Cross multiply
    1,388,799.36x = 1,916,525.88 × 815,891.76
  4. Step 4: Simplify right side
    1,388,799.36x = 1,563,677,673,318.75
  5. Step 5: Solve for x
    x = 1,563,677,673,318.75/1,388,799.36
  6. Step 6: Final answer
    x = 1,125,920.50

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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.