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Finding the Fourth Proportional to 256,374.40, 384,043.20 and 145,436.80

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Solution

The fourth proportional to 256,374.40, 384,043.20 and 145,436.80 is: 217,861.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,374.40 : 384,043.20 = 145,436.80 : x
  2. Step 2: Convert to fraction form
    256,374.40/384,043.20 = 145,436.80/x
  3. Step 3: Cross multiply
    256,374.40x = 384,043.20 × 145,436.80
  4. Step 4: Simplify right side
    256,374.40x = 55,854,014,069.76
  5. Step 5: Solve for x
    x = 55,854,014,069.76/256,374.40
  6. Step 6: Final answer
    x = 217,861.12

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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.