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Finding the Fourth Proportional to 256,596.40, 384,457.20 and 211,981.60

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Solution

The fourth proportional to 256,596.40, 384,457.20 and 211,981.60 is: 317,611.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,596.40 : 384,457.20 = 211,981.60 : x
  2. Step 2: Convert to fraction form
    256,596.40/384,457.20 = 211,981.60/x
  3. Step 3: Cross multiply
    256,596.40x = 384,457.20 × 211,981.60
  4. Step 4: Simplify right side
    256,596.40x = 81,497,852,387.52
  5. Step 5: Solve for x
    x = 81,497,852,387.52/256,596.40
  6. Step 6: Final answer
    x = 317,611.05

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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.