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Finding the Fourth Proportional to 13,219.76, 18,243.30 and 7,630.76

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Solution

The fourth proportional to 13,219.76, 18,243.30 and 7,630.76 is: 10,530.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,219.76 : 18,243.30 = 7,630.76 : x
  2. Step 2: Convert to fraction form
    13,219.76/18,243.30 = 7,630.76/x
  3. Step 3: Cross multiply
    13,219.76x = 18,243.30 × 7,630.76
  4. Step 4: Simplify right side
    13,219.76x = 139,210,243.91
  5. Step 5: Solve for x
    x = 139,210,243.91/13,219.76
  6. Step 6: Final answer
    x = 10,530.47

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Half scale
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Double scale
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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.