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Finding the Fourth Proportional to 12,187.80, 18,281.70 and 8,907.30

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Solution

The fourth proportional to 12,187.80, 18,281.70 and 8,907.30 is: 13,360.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,187.80 : 18,281.70 = 8,907.30 : x
  2. Step 2: Convert to fraction form
    12,187.80/18,281.70 = 8,907.30/x
  3. Step 3: Cross multiply
    12,187.80x = 18,281.70 × 8,907.30
  4. Step 4: Simplify right side
    12,187.80x = 162,840,586.41
  5. Step 5: Solve for x
    x = 162,840,586.41/12,187.80
  6. Step 6: Final answer
    x = 13,360.95

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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.