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Finding the Fourth Proportional to 715,714.12, 987,635.46 and 393,445.36

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Solution

The fourth proportional to 715,714.12, 987,635.46 and 393,445.36 is: 542,927.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,714.12 : 987,635.46 = 393,445.36 : x
  2. Step 2: Convert to fraction form
    715,714.12/987,635.46 = 393,445.36/x
  3. Step 3: Cross multiply
    715,714.12x = 987,635.46 × 393,445.36
  4. Step 4: Simplify right side
    715,714.12x = 388,580,589,108.47
  5. Step 5: Solve for x
    x = 388,580,589,108.47/715,714.12
  6. Step 6: Final answer
    x = 542,927.10

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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.