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Finding the Fourth Proportional to 690.81, 1,036.08 and 252.06

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Solution

The fourth proportional to 690.81, 1,036.08 and 252.06 is: 378.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.81 : 1,036.08 = 252.06 : x
  2. Step 2: Convert to fraction form
    690.81/1,036.08 = 252.06/x
  3. Step 3: Cross multiply
    690.81x = 1,036.08 × 252.06
  4. Step 4: Simplify right side
    690.81x = 261,154.32
  5. Step 5: Solve for x
    x = 261,154.32/690.81
  6. Step 6: Final answer
    x = 378.04

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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.