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Finding the Fourth Proportional to 21,771.40, 32,671.66 and 7,920.40

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Solution

The fourth proportional to 21,771.40, 32,671.66 and 7,920.40 is: 11,885.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,771.40 : 32,671.66 = 7,920.40 : x
  2. Step 2: Convert to fraction form
    21,771.40/32,671.66 = 7,920.40/x
  3. Step 3: Cross multiply
    21,771.40x = 32,671.66 × 7,920.40
  4. Step 4: Simplify right side
    21,771.40x = 258,772,615.86
  5. Step 5: Solve for x
    x = 258,772,615.86/21,771.40
  6. Step 6: Final answer
    x = 11,885.90

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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.