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Finding the Fourth Proportional to 18,688, 28,032 and 7,600.72

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Solution

The fourth proportional to 18,688, 28,032 and 7,600.72 is: 11,401.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,688 : 28,032 = 7,600.72 : x
  2. Step 2: Convert to fraction form
    18,688/28,032 = 7,600.72/x
  3. Step 3: Cross multiply
    18,688x = 28,032 × 7,600.72
  4. Step 4: Simplify right side
    18,688x = 213,063,383.04
  5. Step 5: Solve for x
    x = 213,063,383.04/18,688
  6. Step 6: Final answer
    x = 11,401.08

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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.