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Finding the Fourth Proportional to 690.72, 1,036.07 and 325.54

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Solution

The fourth proportional to 690.72, 1,036.07 and 325.54 is: 488.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.72 : 1,036.07 = 325.54 : x
  2. Step 2: Convert to fraction form
    690.72/1,036.07 = 325.54/x
  3. Step 3: Cross multiply
    690.72x = 1,036.07 × 325.54
  4. Step 4: Simplify right side
    690.72x = 337,282.23
  5. Step 5: Solve for x
    x = 337,282.23/690.72
  6. Step 6: Final answer
    x = 488.31

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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.