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Finding the Fourth Proportional to 8,643.40, 12,965.10 and 8,264.20

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Solution

The fourth proportional to 8,643.40, 12,965.10 and 8,264.20 is: 12,396.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,643.40 : 12,965.10 = 8,264.20 : x
  2. Step 2: Convert to fraction form
    8,643.40/12,965.10 = 8,264.20/x
  3. Step 3: Cross multiply
    8,643.40x = 12,965.10 × 8,264.20
  4. Step 4: Simplify right side
    8,643.40x = 107,146,179.42
  5. Step 5: Solve for x
    x = 107,146,179.42/8,643.40
  6. Step 6: Final answer
    x = 12,396.30

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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.