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Finding the Fourth Proportional to 15,171.70, 20,936.73 and 8,457.58

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Solution

The fourth proportional to 15,171.70, 20,936.73 and 8,457.58 is: 11,671.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,171.70 : 20,936.73 = 8,457.58 : x
  2. Step 2: Convert to fraction form
    15,171.70/20,936.73 = 8,457.58/x
  3. Step 3: Cross multiply
    15,171.70x = 20,936.73 × 8,457.58
  4. Step 4: Simplify right side
    15,171.70x = 177,074,068.91
  5. Step 5: Solve for x
    x = 177,074,068.91/15,171.70
  6. Step 6: Final answer
    x = 11,671.34

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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.