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Finding the Fourth Proportional to 15,131.63, 20,881.65 and 8,507.63

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Solution

The fourth proportional to 15,131.63, 20,881.65 and 8,507.63 is: 11,740.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,131.63 : 20,881.65 = 8,507.63 : x
  2. Step 2: Convert to fraction form
    15,131.63/20,881.65 = 8,507.63/x
  3. Step 3: Cross multiply
    15,131.63x = 20,881.65 × 8,507.63
  4. Step 4: Simplify right side
    15,131.63x = 177,653,247.58
  5. Step 5: Solve for x
    x = 177,653,247.58/15,131.63
  6. Step 6: Final answer
    x = 11,740.53

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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.