Home / 20,418.90-30,587-18,717.90

Finding the Fourth Proportional to 20,418.90, 30,587 and 18,717.90

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Solution

The fourth proportional to 20,418.90, 30,587 and 18,717.90 is: 28,038.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,418.90 : 30,587 = 18,717.90 : x
  2. Step 2: Convert to fraction form
    20,418.90/30,587 = 18,717.90/x
  3. Step 3: Cross multiply
    20,418.90x = 30,587 × 18,717.90
  4. Step 4: Simplify right side
    20,418.90x = 572,524,407.30
  5. Step 5: Solve for x
    x = 572,524,407.30/20,418.90
  6. Step 6: Final answer
    x = 28,038.94

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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.