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Finding the Fourth Proportional to 256,938.80, 385,408.20 and 221,946.80

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Solution

The fourth proportional to 256,938.80, 385,408.20 and 221,946.80 is: 332,920.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,938.80 : 385,408.20 = 221,946.80 : x
  2. Step 2: Convert to fraction form
    256,938.80/385,408.20 = 221,946.80/x
  3. Step 3: Cross multiply
    256,938.80x = 385,408.20 × 221,946.80
  4. Step 4: Simplify right side
    256,938.80x = 85,540,116,683.76
  5. Step 5: Solve for x
    x = 85,540,116,683.76/256,938.80
  6. Step 6: Final answer
    x = 332,920.20

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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.