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Finding the Fourth Proportional to 18,939.79, 28,409.67 and 5,088.79

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Solution

The fourth proportional to 18,939.79, 28,409.67 and 5,088.79 is: 7,633.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939.79 : 28,409.67 = 5,088.79 : x
  2. Step 2: Convert to fraction form
    18,939.79/28,409.67 = 5,088.79/x
  3. Step 3: Cross multiply
    18,939.79x = 28,409.67 × 5,088.79
  4. Step 4: Simplify right side
    18,939.79x = 144,570,844.60
  5. Step 5: Solve for x
    x = 144,570,844.60/18,939.79
  6. Step 6: Final answer
    x = 7,633.18

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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.