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Finding the Fourth Proportional to 690.82, 1,036.25 and 257.89

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Solution

The fourth proportional to 690.82, 1,036.25 and 257.89 is: 386.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.82 : 1,036.25 = 257.89 : x
  2. Step 2: Convert to fraction form
    690.82/1,036.25 = 257.89/x
  3. Step 3: Cross multiply
    690.82x = 1,036.25 × 257.89
  4. Step 4: Simplify right side
    690.82x = 267,238.51
  5. Step 5: Solve for x
    x = 267,238.51/690.82
  6. Step 6: Final answer
    x = 386.84

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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.