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Finding the Fourth Proportional to 690.27, 1,035.81 and 325.32

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Solution

The fourth proportional to 690.27, 1,035.81 and 325.32 is: 488.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.27 : 1,035.81 = 325.32 : x
  2. Step 2: Convert to fraction form
    690.27/1,035.81 = 325.32/x
  3. Step 3: Cross multiply
    690.27x = 1,035.81 × 325.32
  4. Step 4: Simplify right side
    690.27x = 336,969.71
  5. Step 5: Solve for x
    x = 336,969.71/690.27
  6. Step 6: Final answer
    x = 488.17

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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.