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Finding the Fourth Proportional to 20,521.16, 28,367.02 and 18,305

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Solution

The fourth proportional to 20,521.16, 28,367.02 and 18,305 is: 25,303.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,521.16 : 28,367.02 = 18,305 : x
  2. Step 2: Convert to fraction form
    20,521.16/28,367.02 = 18,305/x
  3. Step 3: Cross multiply
    20,521.16x = 28,367.02 × 18,305
  4. Step 4: Simplify right side
    20,521.16x = 519,258,301.10
  5. Step 5: Solve for x
    x = 519,258,301.10/20,521.16
  6. Step 6: Final answer
    x = 25,303.56

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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.