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Finding the Fourth Proportional to 715,841.13, 987,851.88 and 393,548.40

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Solution

The fourth proportional to 715,841.13, 987,851.88 and 393,548.40 is: 543,091.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,841.13 : 987,851.88 = 393,548.40 : x
  2. Step 2: Convert to fraction form
    715,841.13/987,851.88 = 393,548.40/x
  3. Step 3: Cross multiply
    715,841.13x = 987,851.88 × 393,548.40
  4. Step 4: Simplify right side
    715,841.13x = 388,767,526,810.99
  5. Step 5: Solve for x
    x = 388,767,526,810.99/715,841.13
  6. Step 6: Final answer
    x = 543,091.91

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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.