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Finding the Fourth Proportional to 12,807.20, 19,210.80 and 11,813.60

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Solution

The fourth proportional to 12,807.20, 19,210.80 and 11,813.60 is: 17,720.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,807.20 : 19,210.80 = 11,813.60 : x
  2. Step 2: Convert to fraction form
    12,807.20/19,210.80 = 11,813.60/x
  3. Step 3: Cross multiply
    12,807.20x = 19,210.80 × 11,813.60
  4. Step 4: Simplify right side
    12,807.20x = 226,948,706.88
  5. Step 5: Solve for x
    x = 226,948,706.88/12,807.20
  6. Step 6: Final answer
    x = 17,720.40

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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.