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Finding the Fourth Proportional to 256,875.60, 385,313.40 and 212,638.80

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Solution

The fourth proportional to 256,875.60, 385,313.40 and 212,638.80 is: 318,958.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,875.60 : 385,313.40 = 212,638.80 : x
  2. Step 2: Convert to fraction form
    256,875.60/385,313.40 = 212,638.80/x
  3. Step 3: Cross multiply
    256,875.60x = 385,313.40 × 212,638.80
  4. Step 4: Simplify right side
    256,875.60x = 81,932,578,999.92
  5. Step 5: Solve for x
    x = 81,932,578,999.92/256,875.60
  6. Step 6: Final answer
    x = 318,958.20

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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.