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Finding the Fourth Proportional to 15,131.64, 20,881.68 and 8,417.10

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Solution

The fourth proportional to 15,131.64, 20,881.68 and 8,417.10 is: 11,615.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,131.64 : 20,881.68 = 8,417.10 : x
  2. Step 2: Convert to fraction form
    15,131.64/20,881.68 = 8,417.10/x
  3. Step 3: Cross multiply
    15,131.64x = 20,881.68 × 8,417.10
  4. Step 4: Simplify right side
    15,131.64x = 175,763,188.73
  5. Step 5: Solve for x
    x = 175,763,188.73/15,131.64
  6. Step 6: Final answer
    x = 11,615.61

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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.