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Finding the Fourth Proportional to 715,818.51, 987,804.35 and 393,526.25

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Solution

The fourth proportional to 715,818.51, 987,804.35 and 393,526.25 is: 543,052.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,818.51 : 987,804.35 = 393,526.25 : x
  2. Step 2: Convert to fraction form
    715,818.51/987,804.35 = 393,526.25/x
  3. Step 3: Cross multiply
    715,818.51x = 987,804.35 × 393,526.25
  4. Step 4: Simplify right side
    715,818.51x = 388,726,934,682.54
  5. Step 5: Solve for x
    x = 388,726,934,682.54/715,818.51
  6. Step 6: Final answer
    x = 543,052.36

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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.