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Finding the Fourth Proportional to 18,739, 28,108.77 and 4,888

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Solution

The fourth proportional to 18,739, 28,108.77 and 4,888 is: 7,332.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,739 : 28,108.77 = 4,888 : x
  2. Step 2: Convert to fraction form
    18,739/28,108.77 = 4,888/x
  3. Step 3: Cross multiply
    18,739x = 28,108.77 × 4,888
  4. Step 4: Simplify right side
    18,739x = 137,395,667.76
  5. Step 5: Solve for x
    x = 137,395,667.76/18,739
  6. Step 6: Final answer
    x = 7,332.07

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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.