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Finding the Fourth Proportional to 715,805.46, 987,798.42 and 393,512.64

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Solution

The fourth proportional to 715,805.46, 987,798.42 and 393,512.64 is: 543,040.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,805.46 : 987,798.42 = 393,512.64 : x
  2. Step 2: Convert to fraction form
    715,805.46/987,798.42 = 393,512.64/x
  3. Step 3: Cross multiply
    715,805.46x = 987,798.42 × 393,512.64
  4. Step 4: Simplify right side
    715,805.46x = 388,711,164,042.03
  5. Step 5: Solve for x
    x = 388,711,164,042.03/715,805.46
  6. Step 6: Final answer
    x = 543,040.23

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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.