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Finding the Fourth Proportional to 2,219.81, 3,330.47 and 988.07

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Solution

The fourth proportional to 2,219.81, 3,330.47 and 988.07 is: 1,482.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,219.81 : 3,330.47 = 988.07 : x
  2. Step 2: Convert to fraction form
    2,219.81/3,330.47 = 988.07/x
  3. Step 3: Cross multiply
    2,219.81x = 3,330.47 × 988.07
  4. Step 4: Simplify right side
    2,219.81x = 3,290,723.31
  5. Step 5: Solve for x
    x = 3,290,723.31/2,219.81
  6. Step 6: Final answer
    x = 1,482.44

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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.