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Finding the Fourth Proportional to 601.70, 829.80 and 391.66

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Solution

The fourth proportional to 601.70, 829.80 and 391.66 is: 540.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    601.70 : 829.80 = 391.66 : x
  2. Step 2: Convert to fraction form
    601.70/829.80 = 391.66/x
  3. Step 3: Cross multiply
    601.70x = 829.80 × 391.66
  4. Step 4: Simplify right side
    601.70x = 324,999.47
  5. Step 5: Solve for x
    x = 324,999.47/601.70
  6. Step 6: Final answer
    x = 540.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.