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Finding the Fourth Proportional to 13,615.17, 18,785.64 and 7,946.68

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Solution

The fourth proportional to 13,615.17, 18,785.64 and 7,946.68 is: 10,964.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,615.17 : 18,785.64 = 7,946.68 : x
  2. Step 2: Convert to fraction form
    13,615.17/18,785.64 = 7,946.68/x
  3. Step 3: Cross multiply
    13,615.17x = 18,785.64 × 7,946.68
  4. Step 4: Simplify right side
    13,615.17x = 149,283,469.68
  5. Step 5: Solve for x
    x = 149,283,469.68/13,615.17
  6. Step 6: Final answer
    x = 10,964.50

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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.