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Finding the Fourth Proportional to 18,999.79, 28,484.32 and 7,914.81

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Solution

The fourth proportional to 18,999.79, 28,484.32 and 7,914.81 is: 11,865.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,999.79 : 28,484.32 = 7,914.81 : x
  2. Step 2: Convert to fraction form
    18,999.79/28,484.32 = 7,914.81/x
  3. Step 3: Cross multiply
    18,999.79x = 28,484.32 × 7,914.81
  4. Step 4: Simplify right side
    18,999.79x = 225,448,082.65
  5. Step 5: Solve for x
    x = 225,448,082.65/18,999.79
  6. Step 6: Final answer
    x = 11,865.82

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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.