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Finding the Fourth Proportional to 15,131.80, 20,881.46 and 8,417.08

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Solution

The fourth proportional to 15,131.80, 20,881.46 and 8,417.08 is: 11,615.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,131.80 : 20,881.46 = 8,417.08 : x
  2. Step 2: Convert to fraction form
    15,131.80/20,881.46 = 8,417.08/x
  3. Step 3: Cross multiply
    15,131.80x = 20,881.46 × 8,417.08
  4. Step 4: Simplify right side
    15,131.80x = 175,760,919.34
  5. Step 5: Solve for x
    x = 175,760,919.34/15,131.80
  6. Step 6: Final answer
    x = 11,615.33

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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.