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Finding the Fourth Proportional to 313,185.76, 432,015.60 and 199,880.80

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Solution

The fourth proportional to 313,185.76, 432,015.60 and 199,880.80 is: 275,720.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    313,185.76 : 432,015.60 = 199,880.80 : x
  2. Step 2: Convert to fraction form
    313,185.76/432,015.60 = 199,880.80/x
  3. Step 3: Cross multiply
    313,185.76x = 432,015.60 × 199,880.80
  4. Step 4: Simplify right side
    313,185.76x = 86,351,623,740.48
  5. Step 5: Solve for x
    x = 86,351,623,740.48/313,185.76
  6. Step 6: Final answer
    x = 275,720.15

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1.5x scale

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.