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Finding the Fourth Proportional to 18,998.96, 28,499.64 and 7,312.16

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Solution

The fourth proportional to 18,998.96, 28,499.64 and 7,312.16 is: 10,968.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,998.96 : 28,499.64 = 7,312.16 : x
  2. Step 2: Convert to fraction form
    18,998.96/28,499.64 = 7,312.16/x
  3. Step 3: Cross multiply
    18,998.96x = 28,499.64 × 7,312.16
  4. Step 4: Simplify right side
    18,998.96x = 208,393,927.62
  5. Step 5: Solve for x
    x = 208,393,927.62/18,998.96
  6. Step 6: Final answer
    x = 10,968.70

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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.