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Finding the Fourth Proportional to 660.64, 991.56 and 352.74

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Solution

The fourth proportional to 660.64, 991.56 and 352.74 is: 529.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.64 : 991.56 = 352.74 : x
  2. Step 2: Convert to fraction form
    660.64/991.56 = 352.74/x
  3. Step 3: Cross multiply
    660.64x = 991.56 × 352.74
  4. Step 4: Simplify right side
    660.64x = 349,762.87
  5. Step 5: Solve for x
    x = 349,762.87/660.64
  6. Step 6: Final answer
    x = 529.43

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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.