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Finding the Fourth Proportional to 18,687, 28,030.50 and 7,005.72

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Solution

The fourth proportional to 18,687, 28,030.50 and 7,005.72 is: 10,508.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,687 : 28,030.50 = 7,005.72 : x
  2. Step 2: Convert to fraction form
    18,687/28,030.50 = 7,005.72/x
  3. Step 3: Cross multiply
    18,687x = 28,030.50 × 7,005.72
  4. Step 4: Simplify right side
    18,687x = 196,373,834.46
  5. Step 5: Solve for x
    x = 196,373,834.46/18,687
  6. Step 6: Final answer
    x = 10,508.58

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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.