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Finding the Fourth Proportional to 70,658.60, 105,987.90 and 18,072.20

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Solution

The fourth proportional to 70,658.60, 105,987.90 and 18,072.20 is: 27,108.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,658.60 : 105,987.90 = 18,072.20 : x
  2. Step 2: Convert to fraction form
    70,658.60/105,987.90 = 18,072.20/x
  3. Step 3: Cross multiply
    70,658.60x = 105,987.90 × 18,072.20
  4. Step 4: Simplify right side
    70,658.60x = 1,915,434,526.38
  5. Step 5: Solve for x
    x = 1,915,434,526.38/70,658.60
  6. Step 6: Final answer
    x = 27,108.30

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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.