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Finding the Fourth Proportional to 18,722.80, 28,084.20 and 4,871.80

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Solution

The fourth proportional to 18,722.80, 28,084.20 and 4,871.80 is: 7,307.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,722.80 : 28,084.20 = 4,871.80 : x
  2. Step 2: Convert to fraction form
    18,722.80/28,084.20 = 4,871.80/x
  3. Step 3: Cross multiply
    18,722.80x = 28,084.20 × 4,871.80
  4. Step 4: Simplify right side
    18,722.80x = 136,820,605.56
  5. Step 5: Solve for x
    x = 136,820,605.56/18,722.80
  6. Step 6: Final answer
    x = 7,307.70

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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.