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Finding the Fourth Proportional to 70,610.40, 105,915.52 and 18,019.88

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Solution

The fourth proportional to 70,610.40, 105,915.52 and 18,019.88 is: 27,029.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,610.40 : 105,915.52 = 18,019.88 : x
  2. Step 2: Convert to fraction form
    70,610.40/105,915.52 = 18,019.88/x
  3. Step 3: Cross multiply
    70,610.40x = 105,915.52 × 18,019.88
  4. Step 4: Simplify right side
    70,610.40x = 1,908,584,960.54
  5. Step 5: Solve for x
    x = 1,908,584,960.54/70,610.40
  6. Step 6: Final answer
    x = 27,029.80

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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.