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Finding the Fourth Proportional to 12,992.80, 19,489.20 and 5,207.20

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Solution

The fourth proportional to 12,992.80, 19,489.20 and 5,207.20 is: 7,810.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,992.80 : 19,489.20 = 5,207.20 : x
  2. Step 2: Convert to fraction form
    12,992.80/19,489.20 = 5,207.20/x
  3. Step 3: Cross multiply
    12,992.80x = 19,489.20 × 5,207.20
  4. Step 4: Simplify right side
    12,992.80x = 101,484,162.24
  5. Step 5: Solve for x
    x = 101,484,162.24/12,992.80
  6. Step 6: Final answer
    x = 7,810.80

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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.