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Finding the Fourth Proportional to 18,738.52, 28,112.02 and 5,590.40

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Solution

The fourth proportional to 18,738.52, 28,112.02 and 5,590.40 is: 8,386.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,738.52 : 28,112.02 = 5,590.40 : x
  2. Step 2: Convert to fraction form
    18,738.52/28,112.02 = 5,590.40/x
  3. Step 3: Cross multiply
    18,738.52x = 28,112.02 × 5,590.40
  4. Step 4: Simplify right side
    18,738.52x = 157,157,436.61
  5. Step 5: Solve for x
    x = 157,157,436.61/18,738.52
  6. Step 6: Final answer
    x = 8,386.86

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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.