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Finding the Fourth Proportional to 12,403.70, 18,605.55 and 12,187.70

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Solution

The fourth proportional to 12,403.70, 18,605.55 and 12,187.70 is: 18,281.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,403.70 : 18,605.55 = 12,187.70 : x
  2. Step 2: Convert to fraction form
    12,403.70/18,605.55 = 12,187.70/x
  3. Step 3: Cross multiply
    12,403.70x = 18,605.55 × 12,187.70
  4. Step 4: Simplify right side
    12,403.70x = 226,758,861.74
  5. Step 5: Solve for x
    x = 226,758,861.74/12,403.70
  6. Step 6: Final answer
    x = 18,281.55

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Similar ratio
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1.5x scale

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.