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Finding the Fourth Proportional to 18,839.80, 28,259.70 and 4,988.80

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Solution

The fourth proportional to 18,839.80, 28,259.70 and 4,988.80 is: 7,483.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,839.80 : 28,259.70 = 4,988.80 : x
  2. Step 2: Convert to fraction form
    18,839.80/28,259.70 = 4,988.80/x
  3. Step 3: Cross multiply
    18,839.80x = 28,259.70 × 4,988.80
  4. Step 4: Simplify right side
    18,839.80x = 140,981,991.36
  5. Step 5: Solve for x
    x = 140,981,991.36/18,839.80
  6. Step 6: Final answer
    x = 7,483.20

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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.