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Finding the Fourth Proportional to 256,521.80, 384,345.30 and 218,905.40

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Solution

The fourth proportional to 256,521.80, 384,345.30 and 218,905.40 is: 327,984.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,521.80 : 384,345.30 = 218,905.40 : x
  2. Step 2: Convert to fraction form
    256,521.80/384,345.30 = 218,905.40/x
  3. Step 3: Cross multiply
    256,521.80x = 384,345.30 × 218,905.40
  4. Step 4: Simplify right side
    256,521.80x = 84,135,261,634.62
  5. Step 5: Solve for x
    x = 84,135,261,634.62/256,521.80
  6. Step 6: Final answer
    x = 327,984.84

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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.