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Finding the Fourth Proportional to 18,732.51, 28,112.59 and 8,871.77

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Solution

The fourth proportional to 18,732.51, 28,112.59 and 8,871.77 is: 13,314.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,732.51 : 28,112.59 = 8,871.77 : x
  2. Step 2: Convert to fraction form
    18,732.51/28,112.59 = 8,871.77/x
  3. Step 3: Cross multiply
    18,732.51x = 28,112.59 × 8,871.77
  4. Step 4: Simplify right side
    18,732.51x = 249,408,432.58
  5. Step 5: Solve for x
    x = 249,408,432.58/18,732.51
  6. Step 6: Final answer
    x = 13,314.20

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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.