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Finding the Fourth Proportional to 20,718.88, 31,078.88 and 5,929.12

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Solution

The fourth proportional to 20,718.88, 31,078.88 and 5,929.12 is: 8,893.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,718.88 : 31,078.88 = 5,929.12 : x
  2. Step 2: Convert to fraction form
    20,718.88/31,078.88 = 5,929.12/x
  3. Step 3: Cross multiply
    20,718.88x = 31,078.88 × 5,929.12
  4. Step 4: Simplify right side
    20,718.88x = 184,270,408.99
  5. Step 5: Solve for x
    x = 184,270,408.99/20,718.88
  6. Step 6: Final answer
    x = 8,893.84

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1.5x scale

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.