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Finding the Fourth Proportional to 12,576.89, 18,870.80 and 8,687.67

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Solution

The fourth proportional to 12,576.89, 18,870.80 and 8,687.67 is: 13,035.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,576.89 : 18,870.80 = 8,687.67 : x
  2. Step 2: Convert to fraction form
    12,576.89/18,870.80 = 8,687.67/x
  3. Step 3: Cross multiply
    12,576.89x = 18,870.80 × 8,687.67
  4. Step 4: Simplify right side
    12,576.89x = 163,943,239.60
  5. Step 5: Solve for x
    x = 163,943,239.60/12,576.89
  6. Step 6: Final answer
    x = 13,035.28

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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.