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Finding the Fourth Proportional to 142,404.80, 213,607.20 and 79,419.20

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Solution

The fourth proportional to 142,404.80, 213,607.20 and 79,419.20 is: 119,128.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,404.80 : 213,607.20 = 79,419.20 : x
  2. Step 2: Convert to fraction form
    142,404.80/213,607.20 = 79,419.20/x
  3. Step 3: Cross multiply
    142,404.80x = 213,607.20 × 79,419.20
  4. Step 4: Simplify right side
    142,404.80x = 16,964,512,938.24
  5. Step 5: Solve for x
    x = 16,964,512,938.24/142,404.80
  6. Step 6: Final answer
    x = 119,128.80

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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.