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Finding the Fourth Proportional to 256,005.60, 384,123.60 and 89,912.80

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Solution

The fourth proportional to 256,005.60, 384,123.60 and 89,912.80 is: 134,909.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,005.60 : 384,123.60 = 89,912.80 : x
  2. Step 2: Convert to fraction form
    256,005.60/384,123.60 = 89,912.80/x
  3. Step 3: Cross multiply
    256,005.60x = 384,123.60 × 89,912.80
  4. Step 4: Simplify right side
    256,005.60x = 34,537,628,422.08
  5. Step 5: Solve for x
    x = 34,537,628,422.08/256,005.60
  6. Step 6: Final answer
    x = 134,909.66

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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.