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Finding the Fourth Proportional to 1,808.65, 2,713.28 and 638.61

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Solution

The fourth proportional to 1,808.65, 2,713.28 and 638.61 is: 958.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,808.65 : 2,713.28 = 638.61 : x
  2. Step 2: Convert to fraction form
    1,808.65/2,713.28 = 638.61/x
  3. Step 3: Cross multiply
    1,808.65x = 2,713.28 × 638.61
  4. Step 4: Simplify right side
    1,808.65x = 1,732,727.74
  5. Step 5: Solve for x
    x = 1,732,727.74/1,808.65
  6. Step 6: Final answer
    x = 958.02

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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.