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Finding the Fourth Proportional to 661.50, 991.99 and 250.58

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Solution

The fourth proportional to 661.50, 991.99 and 250.58 is: 375.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.50 : 991.99 = 250.58 : x
  2. Step 2: Convert to fraction form
    661.50/991.99 = 250.58/x
  3. Step 3: Cross multiply
    661.50x = 991.99 × 250.58
  4. Step 4: Simplify right side
    661.50x = 248,572.85
  5. Step 5: Solve for x
    x = 248,572.85/661.50
  6. Step 6: Final answer
    x = 375.77

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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.