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Finding the Fourth Proportional to 661.49, 992.57 and 336.90

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Solution

The fourth proportional to 661.49, 992.57 and 336.90 is: 505.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.49 : 992.57 = 336.90 : x
  2. Step 2: Convert to fraction form
    661.49/992.57 = 336.90/x
  3. Step 3: Cross multiply
    661.49x = 992.57 × 336.90
  4. Step 4: Simplify right side
    661.49x = 334,395.15
  5. Step 5: Solve for x
    x = 334,395.15/661.49
  6. Step 6: Final answer
    x = 505.52

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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.