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Finding the Fourth Proportional to 715,792.62, 987,812.67 and 393,510.84

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Solution

The fourth proportional to 715,792.62, 987,812.67 and 393,510.84 is: 543,055.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,792.62 : 987,812.67 = 393,510.84 : x
  2. Step 2: Convert to fraction form
    715,792.62/987,812.67 = 393,510.84/x
  3. Step 3: Cross multiply
    715,792.62x = 987,812.67 × 393,510.84
  4. Step 4: Simplify right side
    715,792.62x = 388,714,986,627.73
  5. Step 5: Solve for x
    x = 388,714,986,627.73/715,792.62
  6. Step 6: Final answer
    x = 543,055.31

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Double scale
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Similar ratio
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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.