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Finding the Fourth Proportional to 879,838.40, 1,318,882.80 and 405,696.80

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Solution

The fourth proportional to 879,838.40, 1,318,882.80 and 405,696.80 is: 608,141.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    879,838.40 : 1,318,882.80 = 405,696.80 : x
  2. Step 2: Convert to fraction form
    879,838.40/1,318,882.80 = 405,696.80/x
  3. Step 3: Cross multiply
    879,838.40x = 1,318,882.80 × 405,696.80
  4. Step 4: Simplify right side
    879,838.40x = 535,066,531,535.04
  5. Step 5: Solve for x
    x = 535,066,531,535.04/879,838.40
  6. Step 6: Final answer
    x = 608,141.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.