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Finding the Fourth Proportional to 18,690.80, 28,041.60 and 5,543.48

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Solution

The fourth proportional to 18,690.80, 28,041.60 and 5,543.48 is: 8,316.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,690.80 : 28,041.60 = 5,543.48 : x
  2. Step 2: Convert to fraction form
    18,690.80/28,041.60 = 5,543.48/x
  3. Step 3: Cross multiply
    18,690.80x = 28,041.60 × 5,543.48
  4. Step 4: Simplify right side
    18,690.80x = 155,448,048.77
  5. Step 5: Solve for x
    x = 155,448,048.77/18,690.80
  6. Step 6: Final answer
    x = 8,316.82

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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.