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Finding the Fourth Proportional to 19,885.20, 29,770.20 and 17,811.60

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Solution

The fourth proportional to 19,885.20, 29,770.20 and 17,811.60 is: 26,665.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,885.20 : 29,770.20 = 17,811.60 : x
  2. Step 2: Convert to fraction form
    19,885.20/29,770.20 = 17,811.60/x
  3. Step 3: Cross multiply
    19,885.20x = 29,770.20 × 17,811.60
  4. Step 4: Simplify right side
    19,885.20x = 530,254,894.32
  5. Step 5: Solve for x
    x = 530,254,894.32/19,885.20
  6. Step 6: Final answer
    x = 26,665.81

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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.