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Finding the Fourth Proportional to 391,682.56, 540,478.08 and 221,880.32

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Solution

The fourth proportional to 391,682.56, 540,478.08 and 221,880.32 is: 306,170.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,682.56 : 540,478.08 = 221,880.32 : x
  2. Step 2: Convert to fraction form
    391,682.56/540,478.08 = 221,880.32/x
  3. Step 3: Cross multiply
    391,682.56x = 540,478.08 × 221,880.32
  4. Step 4: Simplify right side
    391,682.56x = 119,921,449,343.39
  5. Step 5: Solve for x
    x = 119,921,449,343.39/391,682.56
  6. Step 6: Final answer
    x = 306,170.00

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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.