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Finding the Fourth Proportional to 715,932.64, 987,987.84 and 393,648.16

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Solution

The fourth proportional to 715,932.64, 987,987.84 and 393,648.16 is: 543,234.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,932.64 : 987,987.84 = 393,648.16 : x
  2. Step 2: Convert to fraction form
    715,932.64/987,987.84 = 393,648.16/x
  3. Step 3: Cross multiply
    715,932.64x = 987,987.84 × 393,648.16
  4. Step 4: Simplify right side
    715,932.64x = 388,919,595,318.37
  5. Step 5: Solve for x
    x = 388,919,595,318.37/715,932.64
  6. Step 6: Final answer
    x = 543,234.90

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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.