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Finding the Fourth Proportional to 8,455.80, 12,622.59 and 7,419

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Solution

The fourth proportional to 8,455.80, 12,622.59 and 7,419 is: 11,074.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,455.80 : 12,622.59 = 7,419 : x
  2. Step 2: Convert to fraction form
    8,455.80/12,622.59 = 7,419/x
  3. Step 3: Cross multiply
    8,455.80x = 12,622.59 × 7,419
  4. Step 4: Simplify right side
    8,455.80x = 93,646,995.21
  5. Step 5: Solve for x
    x = 93,646,995.21/8,455.80
  6. Step 6: Final answer
    x = 11,074.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.