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Finding the Fourth Proportional to 15,408.75, 21,264.08 and 8,784.75

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Solution

The fourth proportional to 15,408.75, 21,264.08 and 8,784.75 is: 12,122.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,408.75 : 21,264.08 = 8,784.75 : x
  2. Step 2: Convert to fraction form
    15,408.75/21,264.08 = 8,784.75/x
  3. Step 3: Cross multiply
    15,408.75x = 21,264.08 × 8,784.75
  4. Step 4: Simplify right side
    15,408.75x = 186,799,582.86
  5. Step 5: Solve for x
    x = 186,799,582.86/15,408.75
  6. Step 6: Final answer
    x = 12,122.96

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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.