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Finding the Fourth Proportional to 677,976.32, 939,893.76 and 642,025.28

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Solution

The fourth proportional to 677,976.32, 939,893.76 and 642,025.28 is: 890,054.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    677,976.32 : 939,893.76 = 642,025.28 : x
  2. Step 2: Convert to fraction form
    677,976.32/939,893.76 = 642,025.28/x
  3. Step 3: Cross multiply
    677,976.32x = 939,893.76 × 642,025.28
  4. Step 4: Simplify right side
    677,976.32x = 603,435,554,434.25
  5. Step 5: Solve for x
    x = 603,435,554,434.25/677,976.32
  6. Step 6: Final answer
    x = 890,054.03

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.