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Finding the Fourth Proportional to 715,684.64, 987,633.74 and 393,387.82

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Solution

The fourth proportional to 715,684.64, 987,633.74 and 393,387.82 is: 542,869.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,684.64 : 987,633.74 = 393,387.82 : x
  2. Step 2: Convert to fraction form
    715,684.64/987,633.74 = 393,387.82/x
  3. Step 3: Cross multiply
    715,684.64x = 987,633.74 × 393,387.82
  4. Step 4: Simplify right side
    715,684.64x = 388,523,083,849.07
  5. Step 5: Solve for x
    x = 388,523,083,849.07/715,684.64
  6. Step 6: Final answer
    x = 542,869.11

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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.