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Finding the Fourth Proportional to 879,978.40, 1,319,092.80 and 405,836.80

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Solution

The fourth proportional to 879,978.40, 1,319,092.80 and 405,836.80 is: 608,351.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    879,978.40 : 1,319,092.80 = 405,836.80 : x
  2. Step 2: Convert to fraction form
    879,978.40/1,319,092.80 = 405,836.80/x
  3. Step 3: Cross multiply
    879,978.40x = 1,319,092.80 × 405,836.80
  4. Step 4: Simplify right side
    879,978.40x = 535,336,400,855.04
  5. Step 5: Solve for x
    x = 535,336,400,855.04/879,978.40
  6. Step 6: Final answer
    x = 608,351.75

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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.