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Finding the Fourth Proportional to 2,178.24, 3,266.88 and 638.88

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Solution

The fourth proportional to 2,178.24, 3,266.88 and 638.88 is: 958.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,178.24 : 3,266.88 = 638.88 : x
  2. Step 2: Convert to fraction form
    2,178.24/3,266.88 = 638.88/x
  3. Step 3: Cross multiply
    2,178.24x = 3,266.88 × 638.88
  4. Step 4: Simplify right side
    2,178.24x = 2,087,144.29
  5. Step 5: Solve for x
    x = 2,087,144.29/2,178.24
  6. Step 6: Final answer
    x = 958.18

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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.