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Finding the Fourth Proportional to 18,939.92, 28,409.86 and 5,088.92

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Solution

The fourth proportional to 18,939.92, 28,409.86 and 5,088.92 is: 7,633.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939.92 : 28,409.86 = 5,088.92 : x
  2. Step 2: Convert to fraction form
    18,939.92/28,409.86 = 5,088.92/x
  3. Step 3: Cross multiply
    18,939.92x = 28,409.86 × 5,088.92
  4. Step 4: Simplify right side
    18,939.92x = 144,575,349.98
  5. Step 5: Solve for x
    x = 144,575,349.98/18,939.92
  6. Step 6: Final answer
    x = 7,633.37

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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.