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Finding the Fourth Proportional to 715,692.79, 987,644.94 and 393,395.95

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Solution

The fourth proportional to 715,692.79, 987,644.94 and 393,395.95 is: 542,880.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,692.79 : 987,644.94 = 393,395.95 : x
  2. Step 2: Convert to fraction form
    715,692.79/987,644.94 = 393,395.95/x
  3. Step 3: Cross multiply
    715,692.79x = 987,644.94 × 393,395.95
  4. Step 4: Simplify right side
    715,692.79x = 388,535,519,433.99
  5. Step 5: Solve for x
    x = 388,535,519,433.99/715,692.79
  6. Step 6: Final answer
    x = 542,880.30

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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.