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Finding the Fourth Proportional to 690.76, 1,036.50 and 325.36

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Solution

The fourth proportional to 690.76, 1,036.50 and 325.36 is: 488.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.76 : 1,036.50 = 325.36 : x
  2. Step 2: Convert to fraction form
    690.76/1,036.50 = 325.36/x
  3. Step 3: Cross multiply
    690.76x = 1,036.50 × 325.36
  4. Step 4: Simplify right side
    690.76x = 337,235.64
  5. Step 5: Solve for x
    x = 337,235.64/690.76
  6. Step 6: Final answer
    x = 488.21

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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.