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Finding the Fourth Proportional to 10,918.80, 16,378.20 and 10,116.90

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Solution

The fourth proportional to 10,918.80, 16,378.20 and 10,116.90 is: 15,175.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,918.80 : 16,378.20 = 10,116.90 : x
  2. Step 2: Convert to fraction form
    10,918.80/16,378.20 = 10,116.90/x
  3. Step 3: Cross multiply
    10,918.80x = 16,378.20 × 10,116.90
  4. Step 4: Simplify right side
    10,918.80x = 165,696,611.58
  5. Step 5: Solve for x
    x = 165,696,611.58/10,918.80
  6. Step 6: Final answer
    x = 15,175.35

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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.