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Finding the Fourth Proportional to 268,609.60, 402,428.40 and 212,816.80

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Solution

The fourth proportional to 268,609.60, 402,428.40 and 212,816.80 is: 318,840.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,609.60 : 402,428.40 = 212,816.80 : x
  2. Step 2: Convert to fraction form
    268,609.60/402,428.40 = 212,816.80/x
  3. Step 3: Cross multiply
    268,609.60x = 402,428.40 × 212,816.80
  4. Step 4: Simplify right side
    268,609.60x = 85,643,524,317.12
  5. Step 5: Solve for x
    x = 85,643,524,317.12/268,609.60
  6. Step 6: Final answer
    x = 318,840.15

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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.