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Finding the Fourth Proportional to 18,780.98, 25,916.25 and 10,281.20

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Solution

The fourth proportional to 18,780.98, 25,916.25 and 10,281.20 is: 14,187.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,780.98 : 25,916.25 = 10,281.20 : x
  2. Step 2: Convert to fraction form
    18,780.98/25,916.25 = 10,281.20/x
  3. Step 3: Cross multiply
    18,780.98x = 25,916.25 × 10,281.20
  4. Step 4: Simplify right side
    18,780.98x = 266,450,149.50
  5. Step 5: Solve for x
    x = 266,450,149.50/18,780.98
  6. Step 6: Final answer
    x = 14,187.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.