Home / 28,078.89-42,131.49-12,281.88

Finding the Fourth Proportional to 28,078.89, 42,131.49 and 12,281.88

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Solution

The fourth proportional to 28,078.89, 42,131.49 and 12,281.88 is: 18,428.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,078.89 : 42,131.49 = 12,281.88 : x
  2. Step 2: Convert to fraction form
    28,078.89/42,131.49 = 12,281.88/x
  3. Step 3: Cross multiply
    28,078.89x = 42,131.49 × 12,281.88
  4. Step 4: Simplify right side
    28,078.89x = 517,453,904.40
  5. Step 5: Solve for x
    x = 517,453,904.40/28,078.89
  6. Step 6: Final answer
    x = 18,428.57

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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.