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Finding the Fourth Proportional to 715,491.97, 987,416.75 and 405,454.73

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Solution

The fourth proportional to 715,491.97, 987,416.75 and 405,454.73 is: 559,548.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,491.97 : 987,416.75 = 405,454.73 : x
  2. Step 2: Convert to fraction form
    715,491.97/987,416.75 = 405,454.73/x
  3. Step 3: Cross multiply
    715,491.97x = 987,416.75 × 405,454.73
  4. Step 4: Simplify right side
    715,491.97x = 400,352,792,782.36
  5. Step 5: Solve for x
    x = 400,352,792,782.36/715,491.97
  6. Step 6: Final answer
    x = 559,548.97

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Double scale
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1.5x scale

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.