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Finding the Fourth Proportional to 81,197.40, 121,723.20 and 53,130.90

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Solution

The fourth proportional to 81,197.40, 121,723.20 and 53,130.90 is: 79,648.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,197.40 : 121,723.20 = 53,130.90 : x
  2. Step 2: Convert to fraction form
    81,197.40/121,723.20 = 53,130.90/x
  3. Step 3: Cross multiply
    81,197.40x = 121,723.20 × 53,130.90
  4. Step 4: Simplify right side
    81,197.40x = 6,467,263,166.88
  5. Step 5: Solve for x
    x = 6,467,263,166.88/81,197.40
  6. Step 6: Final answer
    x = 79,648.65

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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.