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Finding the Fourth Proportional to 13,708.76, 18,918.08 and 7,421.12

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Solution

The fourth proportional to 13,708.76, 18,918.08 and 7,421.12 is: 10,241.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,708.76 : 18,918.08 = 7,421.12 : x
  2. Step 2: Convert to fraction form
    13,708.76/18,918.08 = 7,421.12/x
  3. Step 3: Cross multiply
    13,708.76x = 18,918.08 × 7,421.12
  4. Step 4: Simplify right side
    13,708.76x = 140,393,341.85
  5. Step 5: Solve for x
    x = 140,393,341.85/13,708.76
  6. Step 6: Final answer
    x = 10,241.14

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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.