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Finding the Fourth Proportional to 18,976.80, 28,465.20 and 9,113.70

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Solution

The fourth proportional to 18,976.80, 28,465.20 and 9,113.70 is: 13,670.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,976.80 : 28,465.20 = 9,113.70 : x
  2. Step 2: Convert to fraction form
    18,976.80/28,465.20 = 9,113.70/x
  3. Step 3: Cross multiply
    18,976.80x = 28,465.20 × 9,113.70
  4. Step 4: Simplify right side
    18,976.80x = 259,423,293.24
  5. Step 5: Solve for x
    x = 259,423,293.24/18,976.80
  6. Step 6: Final answer
    x = 13,670.55

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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.