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Finding the Fourth Proportional to 18,751.51, 28,127.19 and 5,603.86

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Solution

The fourth proportional to 18,751.51, 28,127.19 and 5,603.86 is: 8,405.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,751.51 : 28,127.19 = 5,603.86 : x
  2. Step 2: Convert to fraction form
    18,751.51/28,127.19 = 5,603.86/x
  3. Step 3: Cross multiply
    18,751.51x = 28,127.19 × 5,603.86
  4. Step 4: Simplify right side
    18,751.51x = 157,620,834.95
  5. Step 5: Solve for x
    x = 157,620,834.95/18,751.51
  6. Step 6: Final answer
    x = 8,405.77

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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.