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Finding the Fourth Proportional to 18,871.41, 28,311.30 and 6,390.39

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Solution

The fourth proportional to 18,871.41, 28,311.30 and 6,390.39 is: 9,587.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.41 : 28,311.30 = 6,390.39 : x
  2. Step 2: Convert to fraction form
    18,871.41/28,311.30 = 6,390.39/x
  3. Step 3: Cross multiply
    18,871.41x = 28,311.30 × 6,390.39
  4. Step 4: Simplify right side
    18,871.41x = 180,920,248.41
  5. Step 5: Solve for x
    x = 180,920,248.41/18,871.41
  6. Step 6: Final answer
    x = 9,587.00

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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.