Home / 8,447.30-12,678.70-4,290.20

Finding the Fourth Proportional to 8,447.30, 12,678.70 and 4,290.20

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Solution

The fourth proportional to 8,447.30, 12,678.70 and 4,290.20 is: 6,439.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,447.30 : 12,678.70 = 4,290.20 : x
  2. Step 2: Convert to fraction form
    8,447.30/12,678.70 = 4,290.20/x
  3. Step 3: Cross multiply
    8,447.30x = 12,678.70 × 4,290.20
  4. Step 4: Simplify right side
    8,447.30x = 54,394,158.74
  5. Step 5: Solve for x
    x = 54,394,158.74/8,447.30
  6. Step 6: Final answer
    x = 6,439.24

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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.