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Finding the Fourth Proportional to 263,419.20, 395,128.80 and 210,931.20

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Solution

The fourth proportional to 263,419.20, 395,128.80 and 210,931.20 is: 316,396.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    263,419.20 : 395,128.80 = 210,931.20 : x
  2. Step 2: Convert to fraction form
    263,419.20/395,128.80 = 210,931.20/x
  3. Step 3: Cross multiply
    263,419.20x = 395,128.80 × 210,931.20
  4. Step 4: Simplify right side
    263,419.20x = 83,344,991,938.56
  5. Step 5: Solve for x
    x = 83,344,991,938.56/263,419.20
  6. Step 6: Final answer
    x = 316,396.80

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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.