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Finding the Fourth Proportional to 81,429.90, 121,950.45 and 81,429.90

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Solution

The fourth proportional to 81,429.90, 121,950.45 and 81,429.90 is: 121,950.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,429.90 : 121,950.45 = 81,429.90 : x
  2. Step 2: Convert to fraction form
    81,429.90/121,950.45 = 81,429.90/x
  3. Step 3: Cross multiply
    81,429.90x = 121,950.45 × 81,429.90
  4. Step 4: Simplify right side
    81,429.90x = 9,930,412,948.46
  5. Step 5: Solve for x
    x = 9,930,412,948.46/81,429.90
  6. Step 6: Final answer
    x = 121,950.45

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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.