Home / 1,388,168.79-1,915,770.54-776,378.47

Finding the Fourth Proportional to 1,388,168.79, 1,915,770.54 and 776,378.47

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Solution

The fourth proportional to 1,388,168.79, 1,915,770.54 and 776,378.47 is: 1,071,456.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388,168.79 : 1,915,770.54 = 776,378.47 : x
  2. Step 2: Convert to fraction form
    1,388,168.79/1,915,770.54 = 776,378.47/x
  3. Step 3: Cross multiply
    1,388,168.79x = 1,915,770.54 × 776,378.47
  4. Step 4: Simplify right side
    1,388,168.79x = 1,487,362,998,063.21
  5. Step 5: Solve for x
    x = 1,487,362,998,063.21/1,388,168.79
  6. Step 6: Final answer
    x = 1,071,456.88

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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.