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Finding the Fourth Proportional to 323,748.40, 485,104.20 and 212,810.80

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Solution

The fourth proportional to 323,748.40, 485,104.20 and 212,810.80 is: 318,875.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    323,748.40 : 485,104.20 = 212,810.80 : x
  2. Step 2: Convert to fraction form
    323,748.40/485,104.20 = 212,810.80/x
  3. Step 3: Cross multiply
    323,748.40x = 485,104.20 × 212,810.80
  4. Step 4: Simplify right side
    323,748.40x = 103,235,412,885.36
  5. Step 5: Solve for x
    x = 103,235,412,885.36/323,748.40
  6. Step 6: Final answer
    x = 318,875.44

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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.