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Finding the Fourth Proportional to 8,459.79, 12,689.05 and 3,780.21

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Solution

The fourth proportional to 8,459.79, 12,689.05 and 3,780.21 is: 5,670.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,459.79 : 12,689.05 = 3,780.21 : x
  2. Step 2: Convert to fraction form
    8,459.79/12,689.05 = 3,780.21/x
  3. Step 3: Cross multiply
    8,459.79x = 12,689.05 × 3,780.21
  4. Step 4: Simplify right side
    8,459.79x = 47,967,273.70
  5. Step 5: Solve for x
    x = 47,967,273.70/8,459.79
  6. Step 6: Final answer
    x = 5,670.03

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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.