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Finding the Fourth Proportional to 18,870.42, 28,305.88 and 7,184.28

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Solution

The fourth proportional to 18,870.42, 28,305.88 and 7,184.28 is: 10,776.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,870.42 : 28,305.88 = 7,184.28 : x
  2. Step 2: Convert to fraction form
    18,870.42/28,305.88 = 7,184.28/x
  3. Step 3: Cross multiply
    18,870.42x = 28,305.88 × 7,184.28
  4. Step 4: Simplify right side
    18,870.42x = 203,357,367.57
  5. Step 5: Solve for x
    x = 203,357,367.57/18,870.42
  6. Step 6: Final answer
    x = 10,776.52

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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.