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Finding the Fourth Proportional to 18,945.42, 28,398.42 and 10,613.22

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Solution

The fourth proportional to 18,945.42, 28,398.42 and 10,613.22 is: 15,908.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,945.42 : 28,398.42 = 10,613.22 : x
  2. Step 2: Convert to fraction form
    18,945.42/28,398.42 = 10,613.22/x
  3. Step 3: Cross multiply
    18,945.42x = 28,398.42 × 10,613.22
  4. Step 4: Simplify right side
    18,945.42x = 301,398,679.11
  5. Step 5: Solve for x
    x = 301,398,679.11/18,945.42
  6. Step 6: Final answer
    x = 15,908.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.