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Finding the Fourth Proportional to 8,459.19, 12,679.39 and 4,290.59

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Solution

The fourth proportional to 8,459.19, 12,679.39 and 4,290.59 is: 6,431.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,459.19 : 12,679.39 = 4,290.59 : x
  2. Step 2: Convert to fraction form
    8,459.19/12,679.39 = 4,290.59/x
  3. Step 3: Cross multiply
    8,459.19x = 12,679.39 × 4,290.59
  4. Step 4: Simplify right side
    8,459.19x = 54,402,041.75
  5. Step 5: Solve for x
    x = 54,402,041.75/8,459.19
  6. Step 6: Final answer
    x = 6,431.11

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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.