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Finding the Fourth Proportional to 19,886.40, 29,840.40 and 8,200.80

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Solution

The fourth proportional to 19,886.40, 29,840.40 and 8,200.80 is: 12,305.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,886.40 : 29,840.40 = 8,200.80 : x
  2. Step 2: Convert to fraction form
    19,886.40/29,840.40 = 8,200.80/x
  3. Step 3: Cross multiply
    19,886.40x = 29,840.40 × 8,200.80
  4. Step 4: Simplify right side
    19,886.40x = 244,715,152.32
  5. Step 5: Solve for x
    x = 244,715,152.32/19,886.40
  6. Step 6: Final answer
    x = 12,305.65

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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.