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Finding the Fourth Proportional to 40,991.40, 61,478.70 and 11,401.80

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Solution

The fourth proportional to 40,991.40, 61,478.70 and 11,401.80 is: 17,100.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,991.40 : 61,478.70 = 11,401.80 : x
  2. Step 2: Convert to fraction form
    40,991.40/61,478.70 = 11,401.80/x
  3. Step 3: Cross multiply
    40,991.40x = 61,478.70 × 11,401.80
  4. Step 4: Simplify right side
    40,991.40x = 700,967,841.66
  5. Step 5: Solve for x
    x = 700,967,841.66/40,991.40
  6. Step 6: Final answer
    x = 17,100.36

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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.