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Finding the Fourth Proportional to 405,112.80, 607,669.20 and 254,865.90

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Solution

The fourth proportional to 405,112.80, 607,669.20 and 254,865.90 is: 382,298.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,112.80 : 607,669.20 = 254,865.90 : x
  2. Step 2: Convert to fraction form
    405,112.80/607,669.20 = 254,865.90/x
  3. Step 3: Cross multiply
    405,112.80x = 607,669.20 × 254,865.90
  4. Step 4: Simplify right side
    405,112.80x = 154,874,157,560.28
  5. Step 5: Solve for x
    x = 154,874,157,560.28/405,112.80
  6. Step 6: Final answer
    x = 382,298.85

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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.