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Finding the Fourth Proportional to 18,821.80, 28,281.30 and 16,683.40

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Solution

The fourth proportional to 18,821.80, 28,281.30 and 16,683.40 is: 25,068.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,821.80 : 28,281.30 = 16,683.40 : x
  2. Step 2: Convert to fraction form
    18,821.80/28,281.30 = 16,683.40/x
  3. Step 3: Cross multiply
    18,821.80x = 28,281.30 × 16,683.40
  4. Step 4: Simplify right side
    18,821.80x = 471,828,240.42
  5. Step 5: Solve for x
    x = 471,828,240.42/18,821.80
  6. Step 6: Final answer
    x = 25,068.18

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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.