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Finding the Fourth Proportional to 12,478.79, 18,720.98 and 4,687.67

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Solution

The fourth proportional to 12,478.79, 18,720.98 and 4,687.67 is: 7,032.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,478.79 : 18,720.98 = 4,687.67 : x
  2. Step 2: Convert to fraction form
    12,478.79/18,720.98 = 4,687.67/x
  3. Step 3: Cross multiply
    12,478.79x = 18,720.98 × 4,687.67
  4. Step 4: Simplify right side
    12,478.79x = 87,757,752.88
  5. Step 5: Solve for x
    x = 87,757,752.88/12,478.79
  6. Step 6: Final answer
    x = 7,032.55

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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.