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Finding the Fourth Proportional to 80,790, 121,185.60 and 28,199.53

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Solution

The fourth proportional to 80,790, 121,185.60 and 28,199.53 is: 42,299.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,790 : 121,185.60 = 28,199.53 : x
  2. Step 2: Convert to fraction form
    80,790/121,185.60 = 28,199.53/x
  3. Step 3: Cross multiply
    80,790x = 121,185.60 × 28,199.53
  4. Step 4: Simplify right side
    80,790x = 3,417,376,962.77
  5. Step 5: Solve for x
    x = 3,417,376,962.77/80,790
  6. Step 6: Final answer
    x = 42,299.50

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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.