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Finding the Fourth Proportional to 22,383.60, 30,888.90 and 12,311.70

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Solution

The fourth proportional to 22,383.60, 30,888.90 and 12,311.70 is: 16,989.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,383.60 : 30,888.90 = 12,311.70 : x
  2. Step 2: Convert to fraction form
    22,383.60/30,888.90 = 12,311.70/x
  3. Step 3: Cross multiply
    22,383.60x = 30,888.90 × 12,311.70
  4. Step 4: Simplify right side
    22,383.60x = 380,294,870.13
  5. Step 5: Solve for x
    x = 380,294,870.13/22,383.60
  6. Step 6: Final answer
    x = 16,989.89

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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.