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Finding the Fourth Proportional to 715,860.66, 987,878.76 and 393,567.90

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Solution

The fourth proportional to 715,860.66, 987,878.76 and 393,567.90 is: 543,118.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,860.66 : 987,878.76 = 393,567.90 : x
  2. Step 2: Convert to fraction form
    715,860.66/987,878.76 = 393,567.90/x
  3. Step 3: Cross multiply
    715,860.66x = 987,878.76 × 393,567.90
  4. Step 4: Simplify right side
    715,860.66x = 388,797,369,027.80
  5. Step 5: Solve for x
    x = 388,797,369,027.80/715,860.66
  6. Step 6: Final answer
    x = 543,118.78

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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.