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Finding the Fourth Proportional to 18,865.80, 28,298.70 and 17,116.20

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Solution

The fourth proportional to 18,865.80, 28,298.70 and 17,116.20 is: 25,674.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,865.80 : 28,298.70 = 17,116.20 : x
  2. Step 2: Convert to fraction form
    18,865.80/28,298.70 = 17,116.20/x
  3. Step 3: Cross multiply
    18,865.80x = 28,298.70 × 17,116.20
  4. Step 4: Simplify right side
    18,865.80x = 484,366,208.94
  5. Step 5: Solve for x
    x = 484,366,208.94/18,865.80
  6. Step 6: Final answer
    x = 25,674.30

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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.