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Finding the Fourth Proportional to 8,419.80, 12,605.40 and 7,447.80

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Solution

The fourth proportional to 8,419.80, 12,605.40 and 7,447.80 is: 11,150.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,419.80 : 12,605.40 = 7,447.80 : x
  2. Step 2: Convert to fraction form
    8,419.80/12,605.40 = 7,447.80/x
  3. Step 3: Cross multiply
    8,419.80x = 12,605.40 × 7,447.80
  4. Step 4: Simplify right side
    8,419.80x = 93,882,498.12
  5. Step 5: Solve for x
    x = 93,882,498.12/8,419.80
  6. Step 6: Final answer
    x = 11,150.21

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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.