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Finding the Fourth Proportional to 18,205.90, 27,312.90 and 7,111.60

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Solution

The fourth proportional to 18,205.90, 27,312.90 and 7,111.60 is: 10,668.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,205.90 : 27,312.90 = 7,111.60 : x
  2. Step 2: Convert to fraction form
    18,205.90/27,312.90 = 7,111.60/x
  3. Step 3: Cross multiply
    18,205.90x = 27,312.90 × 7,111.60
  4. Step 4: Simplify right side
    18,205.90x = 194,238,419.64
  5. Step 5: Solve for x
    x = 194,238,419.64/18,205.90
  6. Step 6: Final answer
    x = 10,668.98

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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.