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Finding the Fourth Proportional to 12,390.90, 18,580.20 and 4,493.10

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Solution

The fourth proportional to 12,390.90, 18,580.20 and 4,493.10 is: 6,737.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390.90 : 18,580.20 = 4,493.10 : x
  2. Step 2: Convert to fraction form
    12,390.90/18,580.20 = 4,493.10/x
  3. Step 3: Cross multiply
    12,390.90x = 18,580.20 × 4,493.10
  4. Step 4: Simplify right side
    12,390.90x = 83,482,696.62
  5. Step 5: Solve for x
    x = 83,482,696.62/12,390.90
  6. Step 6: Final answer
    x = 6,737.42

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.