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Finding the Fourth Proportional to 18,939.78, 28,409.66 and 5,088.78

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Solution

The fourth proportional to 18,939.78, 28,409.66 and 5,088.78 is: 7,633.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939.78 : 28,409.66 = 5,088.78 : x
  2. Step 2: Convert to fraction form
    18,939.78/28,409.66 = 5,088.78/x
  3. Step 3: Cross multiply
    18,939.78x = 28,409.66 × 5,088.78
  4. Step 4: Simplify right side
    18,939.78x = 144,570,509.61
  5. Step 5: Solve for x
    x = 144,570,509.61/18,939.78
  6. Step 6: Final answer
    x = 7,633.17

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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.