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Finding the Fourth Proportional to 263,426.80, 393,973.80 and 221,436.40

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Solution

The fourth proportional to 263,426.80, 393,973.80 and 221,436.40 is: 331,174.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    263,426.80 : 393,973.80 = 221,436.40 : x
  2. Step 2: Convert to fraction form
    263,426.80/393,973.80 = 221,436.40/x
  3. Step 3: Cross multiply
    263,426.80x = 393,973.80 × 221,436.40
  4. Step 4: Simplify right side
    263,426.80x = 87,240,139,966.32
  5. Step 5: Solve for x
    x = 87,240,139,966.32/263,426.80
  6. Step 6: Final answer
    x = 331,174.12

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1.5x scale

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.