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Finding the Fourth Proportional to 718,252.99, 991,163.61 and 391,559.25

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Solution

The fourth proportional to 718,252.99, 991,163.61 and 391,559.25 is: 540,337.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,252.99 : 991,163.61 = 391,559.25 : x
  2. Step 2: Convert to fraction form
    718,252.99/991,163.61 = 391,559.25/x
  3. Step 3: Cross multiply
    718,252.99x = 991,163.61 × 391,559.25
  4. Step 4: Simplify right side
    718,252.99x = 388,099,279,758.89
  5. Step 5: Solve for x
    x = 388,099,279,758.89/718,252.99
  6. Step 6: Final answer
    x = 540,337.85

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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.