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Finding the Fourth Proportional to 12,219.40, 16,862.80 and 6,630.40

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Solution

The fourth proportional to 12,219.40, 16,862.80 and 6,630.40 is: 9,149.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,219.40 : 16,862.80 = 6,630.40 : x
  2. Step 2: Convert to fraction form
    12,219.40/16,862.80 = 6,630.40/x
  3. Step 3: Cross multiply
    12,219.40x = 16,862.80 × 6,630.40
  4. Step 4: Simplify right side
    12,219.40x = 111,807,109.12
  5. Step 5: Solve for x
    x = 111,807,109.12/12,219.40
  6. Step 6: Final answer
    x = 9,149.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.