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Finding the Fourth Proportional to 18,918.80, 28,378.20 and 9,077.30

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Solution

The fourth proportional to 18,918.80, 28,378.20 and 9,077.30 is: 13,615.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.80 : 28,378.20 = 9,077.30 : x
  2. Step 2: Convert to fraction form
    18,918.80/28,378.20 = 9,077.30/x
  3. Step 3: Cross multiply
    18,918.80x = 28,378.20 × 9,077.30
  4. Step 4: Simplify right side
    18,918.80x = 257,597,434.86
  5. Step 5: Solve for x
    x = 257,597,434.86/18,918.80
  6. Step 6: Final answer
    x = 13,615.95

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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.