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Finding the Fourth Proportional to 661.07, 991.59 and 383.84

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Solution

The fourth proportional to 661.07, 991.59 and 383.84 is: 575.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.07 : 991.59 = 383.84 : x
  2. Step 2: Convert to fraction form
    661.07/991.59 = 383.84/x
  3. Step 3: Cross multiply
    661.07x = 991.59 × 383.84
  4. Step 4: Simplify right side
    661.07x = 380,611.91
  5. Step 5: Solve for x
    x = 380,611.91/661.07
  6. Step 6: Final answer
    x = 575.75

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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.