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Finding the Fourth Proportional to 15,090.68, 20,818.14 and 9,421.76

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Solution

The fourth proportional to 15,090.68, 20,818.14 and 9,421.76 is: 12,997.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,090.68 : 20,818.14 = 9,421.76 : x
  2. Step 2: Convert to fraction form
    15,090.68/20,818.14 = 9,421.76/x
  3. Step 3: Cross multiply
    15,090.68x = 20,818.14 × 9,421.76
  4. Step 4: Simplify right side
    15,090.68x = 196,143,518.73
  5. Step 5: Solve for x
    x = 196,143,518.73/15,090.68
  6. Step 6: Final answer
    x = 12,997.66

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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.