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Finding the Fourth Proportional to 18,999.99, 28,499.67 and 7,315.74

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Solution

The fourth proportional to 18,999.99, 28,499.67 and 7,315.74 is: 10,973.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,999.99 : 28,499.67 = 7,315.74 : x
  2. Step 2: Convert to fraction form
    18,999.99/28,499.67 = 7,315.74/x
  3. Step 3: Cross multiply
    18,999.99x = 28,499.67 × 7,315.74
  4. Step 4: Simplify right side
    18,999.99x = 208,496,175.81
  5. Step 5: Solve for x
    x = 208,496,175.81/18,999.99
  6. Step 6: Final answer
    x = 10,973.49

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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.