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Finding the Fourth Proportional to 657.39, 985.55 and 440.85

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Solution

The fourth proportional to 657.39, 985.55 and 440.85 is: 660.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.39 : 985.55 = 440.85 : x
  2. Step 2: Convert to fraction form
    657.39/985.55 = 440.85/x
  3. Step 3: Cross multiply
    657.39x = 985.55 × 440.85
  4. Step 4: Simplify right side
    657.39x = 434,477.51
  5. Step 5: Solve for x
    x = 434,477.51/657.39
  6. Step 6: Final answer
    x = 660.91

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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.