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Finding the Fourth Proportional to 660.94, 991.64 and 309.86

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Solution

The fourth proportional to 660.94, 991.64 and 309.86 is: 464.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.94 : 991.64 = 309.86 : x
  2. Step 2: Convert to fraction form
    660.94/991.64 = 309.86/x
  3. Step 3: Cross multiply
    660.94x = 991.64 × 309.86
  4. Step 4: Simplify right side
    660.94x = 307,264.61
  5. Step 5: Solve for x
    x = 307,264.61/660.94
  6. Step 6: Final answer
    x = 464.89

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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.