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Finding the Fourth Proportional to 30,660.40, 42,310.80 and 17,049.28

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Solution

The fourth proportional to 30,660.40, 42,310.80 and 17,049.28 is: 23,527.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,660.40 : 42,310.80 = 17,049.28 : x
  2. Step 2: Convert to fraction form
    30,660.40/42,310.80 = 17,049.28/x
  3. Step 3: Cross multiply
    30,660.40x = 42,310.80 × 17,049.28
  4. Step 4: Simplify right side
    30,660.40x = 721,368,676.22
  5. Step 5: Solve for x
    x = 721,368,676.22/30,660.40
  6. Step 6: Final answer
    x = 23,527.70

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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.