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Finding the Fourth Proportional to 660.87, 990.43 and 352.06

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Solution

The fourth proportional to 660.87, 990.43 and 352.06 is: 527.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.87 : 990.43 = 352.06 : x
  2. Step 2: Convert to fraction form
    660.87/990.43 = 352.06/x
  3. Step 3: Cross multiply
    660.87x = 990.43 × 352.06
  4. Step 4: Simplify right side
    660.87x = 348,684.07
  5. Step 5: Solve for x
    x = 348,684.07/660.87
  6. Step 6: Final answer
    x = 527.62

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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.