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Finding the Fourth Proportional to 7,109.75, 10,664.63 and 1,915.63

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Solution

The fourth proportional to 7,109.75, 10,664.63 and 1,915.63 is: 2,873.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,109.75 : 10,664.63 = 1,915.63 : x
  2. Step 2: Convert to fraction form
    7,109.75/10,664.63 = 1,915.63/x
  3. Step 3: Cross multiply
    7,109.75x = 10,664.63 × 1,915.63
  4. Step 4: Simplify right side
    7,109.75x = 20,429,485.17
  5. Step 5: Solve for x
    x = 20,429,485.17/7,109.75
  6. Step 6: Final answer
    x = 2,873.45

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Similar ratio
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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.