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Finding the Fourth Proportional to 399,687.85, 551,552.79 and 218,405.95

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Solution

The fourth proportional to 399,687.85, 551,552.79 and 218,405.95 is: 301,391.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,687.85 : 551,552.79 = 218,405.95 : x
  2. Step 2: Convert to fraction form
    399,687.85/551,552.79 = 218,405.95/x
  3. Step 3: Cross multiply
    399,687.85x = 551,552.79 × 218,405.95
  4. Step 4: Simplify right side
    399,687.85x = 120,462,411,075.10
  5. Step 5: Solve for x
    x = 120,462,411,075.10/399,687.85
  6. Step 6: Final answer
    x = 301,391.23

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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.