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Finding the Fourth Proportional to 715,947.77, 988,011.60 and 393,678.65

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Solution

The fourth proportional to 715,947.77, 988,011.60 and 393,678.65 is: 543,278.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,947.77 : 988,011.60 = 393,678.65 : x
  2. Step 2: Convert to fraction form
    715,947.77/988,011.60 = 393,678.65/x
  3. Step 3: Cross multiply
    715,947.77x = 988,011.60 × 393,678.65
  4. Step 4: Simplify right side
    715,947.77x = 388,959,072,872.34
  5. Step 5: Solve for x
    x = 388,959,072,872.34/715,947.77
  6. Step 6: Final answer
    x = 543,278.56

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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.