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Finding the Fourth Proportional to 20,784.80, 31,177.20 and 13,008.80

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Solution

The fourth proportional to 20,784.80, 31,177.20 and 13,008.80 is: 19,513.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,784.80 : 31,177.20 = 13,008.80 : x
  2. Step 2: Convert to fraction form
    20,784.80/31,177.20 = 13,008.80/x
  3. Step 3: Cross multiply
    20,784.80x = 31,177.20 × 13,008.80
  4. Step 4: Simplify right side
    20,784.80x = 405,577,959.36
  5. Step 5: Solve for x
    x = 405,577,959.36/20,784.80
  6. Step 6: Final answer
    x = 19,513.20

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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.