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Finding the Fourth Proportional to 18,990.32, 28,482.84 and 4,949.20

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Solution

The fourth proportional to 18,990.32, 28,482.84 and 4,949.20 is: 7,423.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.32 : 28,482.84 = 4,949.20 : x
  2. Step 2: Convert to fraction form
    18,990.32/28,482.84 = 4,949.20/x
  3. Step 3: Cross multiply
    18,990.32x = 28,482.84 × 4,949.20
  4. Step 4: Simplify right side
    18,990.32x = 140,967,271.73
  5. Step 5: Solve for x
    x = 140,967,271.73/18,990.32
  6. Step 6: Final answer
    x = 7,423.11

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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.