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Finding the Fourth Proportional to 661.74, 992.85 and 319.50

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Solution

The fourth proportional to 661.74, 992.85 and 319.50 is: 479.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.74 : 992.85 = 319.50 : x
  2. Step 2: Convert to fraction form
    661.74/992.85 = 319.50/x
  3. Step 3: Cross multiply
    661.74x = 992.85 × 319.50
  4. Step 4: Simplify right side
    661.74x = 317,215.58
  5. Step 5: Solve for x
    x = 317,215.58/661.74
  6. Step 6: Final answer
    x = 479.37

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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.