Home / 393,921.74-543,557.31-221,810.78

Finding the Fourth Proportional to 393,921.74, 543,557.31 and 221,810.78

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Solution

The fourth proportional to 393,921.74, 543,557.31 and 221,810.78 is: 306,068.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,921.74 : 543,557.31 = 221,810.78 : x
  2. Step 2: Convert to fraction form
    393,921.74/543,557.31 = 221,810.78/x
  3. Step 3: Cross multiply
    393,921.74x = 543,557.31 × 221,810.78
  4. Step 4: Simplify right side
    393,921.74x = 120,566,870,905.80
  5. Step 5: Solve for x
    x = 120,566,870,905.80/393,921.74
  6. Step 6: Final answer
    x = 306,068.08

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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.